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3. (15 pts) According to the World Almanac, the average wi According to the World Almanac,...
Suppose that the speed at which cars go on the freeway is normally distributed with mean...
Suppose that the speed at which cars go on the freeway is normally distributed with mean 73 mph and standard deviation 8 miles per hour. Let X be the speed for a randomly selected car. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X-N b. If one car is randomly chosen, find the probability that it is traveling more than 72 mph. c. If one of the cars is randomly chosen, find...
Suppose that the speed at which cars go on the freeway is normally distributed with mean...
Suppose that the speed at which cars go on the freeway is normally distributed with mean 68 mph and standard deviation 6 miles per hour. Let X be the speed for a randomly selected car. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X ~ N(_____,______) b. If one car is randomly chosen, find the probability that it is traveling more than 69 mph. ________ c. If one of the cars is...
Question 4 10 points A stunt person injures himself an average of three times a year....
Question 4 10 points A stunt person injures himself an average of three times a year. The probability that he will be injured More than three times this year is: O 0.6472 O 0.4232 0.3528 O 0.5768 Question 5* 20 points A radar unit is used to measure speeds of cars on a motorway. The speeds are normally distributed with a mean of 90 km/hour and a standard deviation of 10 km/hour. The probability that a car picked at random...
(Sec. 4.3) An average light bulb manufactured at The Lightbulb Company lasts and average of 300...
(Sec. 4.3) An average light bulb manufactured at The Lightbulb Company lasts and average of 300 days, with a standard deviation of 50 days. Suppose the lifespan of a light bulb from this company is normally distributed. (a) What is the probability that a light bulb from this company lasts less than 210 days? More than 330 days? (b) What is the probability that a light bulb from this company lasts between 280 and 380 days? (c) How would you...
A brisk walk at 4 miles per hour burns an average of 280 calories per hour
A brisk walk at 4 miles per hour burns an average of 280 calories per hour. If the standard deviation of the distribution is 5 calories, find the probability that a person who walks 1 hour at the rate of 4 miles per hour will burn the given number of calories. Assume the random variable is normally distributed. Refer to the table of values (Area Under the Standard Normal Distribution ) as needed. If necessary, round intermediate calculations to the nearest...
The average speed of passenger trains travelling from Kyoto to Tokyo have been found to be...
The average speed of passenger trains travelling from Kyoto to Tokyo have been found to be normally distributed with a mean of 250 km per hour and a standard deviation of 30 km per hour. a. What is the probability that a train will average less than 200 km per hour? b. What is the probability that a train will average more than 300 km per hour? c. What is the probability that a train will average between 210 and...
Exercise 1: The average lifespan of a certain electronic component is 850 days and a standard...
Exercise 1: The average lifespan of a certain electronic component is 850 days and a standard deviation of 40 days. Knowing that the duration is normally distributed, calculate the probability that this component will last: a) between 700 and 1000 days; b) more than 800 days; c) less than 750 days. Exercise 2: A survey reports that 86% of users use Internet Explorer as a browser. You randomly select 200 users and ask them if they use Internet Explorer as...
3) The number of requests for assistance are received by a towing service at an average...
3) The number of requests for assistance are received by a towing service at an average steady rate of 4 per hour. If, during a normal day the requests are received independently of one another, compute the probability that exactly ten requests are received during a particular 2-hour period of a normal day. Suppose, that the dispatcher ignored at least one call between 225pm and 2:45pm. What is the probability that no more than one call was received during this...
According to one study among a certain people group, pregnancy lengths are approximately normally distributed with...
According to one study among a certain people group, pregnancy lengths are approximately normally distributed with a mean of 267 days and a standard deviation of 7 days. Approximately 12.7% of babies are premature, which means that they are born before 37 weeks in the pregnancy. A random sample of 75 pregnant women from this people group is observed and the length of each pregnancy is tracked. Let X be the number of premature babies born to these mothers. What...
#15 and #16 Population a00s tion statistics: ơ.-75 and ơ2: 105 tatistics: -2435, 35 and x...
#15 and #16
Population a00s tion statistics: ơ.-75 and ơ2: 105 tatistics: -2435, 35 and x -2432, 2-90 14. Claim: μι μα α Population statistics: σ1-136 and σ2 -215 mple statistics:5004,n144 and X - 4895, 2 -156 Using and Interpreting Concepts Testing the Difference Between Two Means In Exercises 15-24 (a) identify the claim and state Ho and H. (b) find the critical valuels) and identify the rejection region(s), (c) find the standardized test statistic z, (d) decide wheher to...
Suppose that the speed at which cars go on the freeway is normally distributed with mean 73 mph and standard deviation 8 miles per hour. Let X be the speed for a randomly selected car. Round all answers to 4 decimal places where possible. a. What is the distribution of X? X-N b. If one car is randomly chosen, find the probability that it is traveling more than 72 mph. c. If one of the cars is randomly chosen, find...
Question 4 10 points A stunt person injures himself an average of three times a year. The probability that he will be injured More than three times this year is: O 0.6472 O 0.4232 0.3528 O 0.5768 Question 5* 20 points A radar unit is used to measure speeds of cars on a motorway. The speeds are normally distributed with a mean of 90 km/hour and a standard deviation of 10 km/hour. The probability that a car picked at random...
(Sec. 4.3) An average light bulb manufactured at The Lightbulb Company lasts and average of 300 days, with a standard deviation of 50 days. Suppose the lifespan of a light bulb from this company is normally distributed. (a) What is the probability that a light bulb from this company lasts less than 210 days? More than 330 days? (b) What is the probability that a light bulb from this company lasts between 280 and 380 days? (c) How would you...
#15 and #16
Population a00s tion statistics: ơ.-75 and ơ2: 105 tatistics: -2435, 35 and x -2432, 2-90 14. Claim: μι μα α Population statistics: σ1-136 and σ2 -215 mple statistics:5004,n144 and X - 4895, 2 -156 Using and Interpreting Concepts Testing the Difference Between Two Means In Exercises 15-24 (a) identify the claim and state Ho and H. (b) find the critical valuels) and identify the rejection region(s), (c) find the standardized test statistic z, (d) decide wheher to...
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