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The length of time people generally watch IV during a day is known to be...
Egyptians watch an average of 2.5 hours of television per person per day. If the standard...
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation is 1.6 hours and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a sampling distribution. What is the mean of this sampling distribution? O 1.6 O 225 O 4.7 2.5
Egyptians watch an average of 2.5 hours of television per person per day. If the standard...
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation is 1.6 hours and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a sampling distribution. What is the standard deviation of this sampling distribution? o O 0.107 O 15.234 O 225 1.636
4. Freebirds in IV receives N customers per day, where N is a random variable with...
4. Freebirds in IV receives N customers per day, where
N is a random variable with mean 200
and standard deviation 40. The amount spent by each customer is
normally distributed with
mean $15 and standard deviation $3. The amounts that customers
spend are independent of
each other and independent of N. Find the mean and variance of the
total amount spent at
Freebirds per day.
1. Freebirds in IV receives N customers per day, where N is a random...
4. Let x be a random variable that represents the length of time it takes a...
4. Let x be a random variable that represents the length of time it takes a student to complete a chemistry lab project. From long experience, it is known that x has a normal distribution with mean 1 3 .6 hours and standard deviation - 0.5. Find the chance that a student will take more than 4.5 hours to complete a lab project. 5. Using the information from #4, calculato the chance that the mean length of time for a...
please help with this probability problem! thank you 3. The downtime per day for a certain...
please help with this probability problem! thank you
3. The downtime per day for a certain computing facility averages 4.0 hours, with a standard deviation of 0.8 hours. a. Find the probability that the average daily downtime for a period of 30 days is between 1 and 5 hours b. Find the value of the average amount of downtime in a 30 day period such at only 10% of such 30 day periods has an average greater than that. c....
4. Assume that the length of time between charges of a particular cell phone is normally...
4. Assume that the length of time between charges of a particular cell phone is normally distributed with a mean of 8 hours and a standard deviation of 2 hours. Find the probability that the cell phone will last between 5 and 10 hours between charges. 5. Let X be a continuous random variable with the density function f(x) given by f(0) = 2/8 for 0 < x < 4, and f(1) = 0 otherwise. Find the mean p. 6....
A help desk has two employees with one working during the day and one working at...
A help desk has two employees with one working during the day and one working at night. The number of hours the first employee works (X1) is normally distributed with mean 9 and standard deviation 0.6 and the number of hours the second employee works (X2) is normally distributed with mean 8.9 and standard deviation 1. Suppose that the amount of time that the employees overlap (X3) is normally distributed with mean 0.6 and standard deviation 0.1. Finally, assume that...
A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for...
A nutritionist wants to determine how much time nationally people spend eating and drinking. Suppose for a random sample of 1031 people age 15 or older, the mean amount of time spent eating or drinking per day is 1.14 hours with a standard deviation of 0.56 hour. Determine and interpret a 90% confidence interval for the mean amount of time Americans age 15 or older spend eating and drinking each day.
The length of time a full length movie runs from opening to credits is normally distributed...
The length of time a full length movie runs from opening to credits is normally distributed with a mean of 1.9 hours and standard deviation of 0.3 hours. Calculate the following: A random movie is between 1.8 and 2.0 hours. A movie is longer than 2.3 hours. The length of movie that is shorter than 94% of the movies. Determine the speed of the vehicle, with an average speed of 58 and a standard deviation of 5 Mean and standard...
Couples were recruited for a study of how many words people speak in a day. A...
Couples were recruited for a study of how many words people speak in a day. A random sample of 68 males resulted in a mean of 16,379 words and a standard deviation of 6,718 words. Use a 0.02 significance level to test the claim that males have a standard deviation that is greater than the standard deviation of 6,281 words for females. Assume that the population is normally distributed. Identify the following to within 2 decimal places: A. The null...
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation is 1.6 hours and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a sampling distribution. What is the mean of this sampling distribution? O 1.6 O 225 O 4.7 2.5
Egyptians watch an average of 2.5 hours of television per person per day. If the standard deviation is 1.6 hours and a random sample of 225 Egyptians is selected, the mean of this sample belongs to a sampling distribution. What is the standard deviation of this sampling distribution? o O 0.107 O 15.234 O 225 1.636
4. Freebirds in IV receives N customers per day, where
N is a random variable with mean 200
and standard deviation 40. The amount spent by each customer is
normally distributed with
mean $15 and standard deviation $3. The amounts that customers
spend are independent of
each other and independent of N. Find the mean and variance of the
total amount spent at
Freebirds per day.
1. Freebirds in IV receives N customers per day, where N is a random...
4. Let x be a random variable that represents the length of time it takes a student to complete a chemistry lab project. From long experience, it is known that x has a normal distribution with mean 1 3 .6 hours and standard deviation - 0.5. Find the chance that a student will take more than 4.5 hours to complete a lab project. 5. Using the information from #4, calculato the chance that the mean length of time for a...
please help with this probability problem! thank you
3. The downtime per day for a certain computing facility averages 4.0 hours, with a standard deviation of 0.8 hours. a. Find the probability that the average daily downtime for a period of 30 days is between 1 and 5 hours b. Find the value of the average amount of downtime in a 30 day period such at only 10% of such 30 day periods has an average greater than that. c....
4. Assume that the length of time between charges of a particular cell phone is normally distributed with a mean of 8 hours and a standard deviation of 2 hours. Find the probability that the cell phone will last between 5 and 10 hours between charges. 5. Let X be a continuous random variable with the density function f(x) given by f(0) = 2/8 for 0 < x < 4, and f(1) = 0 otherwise. Find the mean p. 6....
A help desk has two employees with one working during the day and one working at night. The number of hours the first employee works (X1) is normally distributed with mean 9 and standard deviation 0.6 and the number of hours the second employee works (X2) is normally distributed with mean 8.9 and standard deviation 1. Suppose that the amount of time that the employees overlap (X3) is normally distributed with mean 0.6 and standard deviation 0.1. Finally, assume that...
Couples were recruited for a study of how many words people speak in a day. A random sample of 68 males resulted in a mean of 16,379 words and a standard deviation of 6,718 words. Use a 0.02 significance level to test the claim that males have a standard deviation that is greater than the standard deviation of 6,281 words for females. Assume that the population is normally distributed. Identify the following to within 2 decimal places: A. The null...
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