1. A certain type of radio tubes lasts on the average of 2 years with the...
1. A certain type of radio tubes lasts on the average of 2 years with the standard deviation of 0.4 year. Assuming that the radio tubes are normally distributed. Find the probability that given tubes will last less than 1.5 years.
- Two hundred college freshmen have their grades in the normal distribution with the mean of 2.2 and standard deviation of 0.6. How many of these freshmen have their grades between 2.0 and 2.5 inclusive?
- Suppose that in an examination, the cut off scores for passing is 75 for 200 people. If the mean of the test is 84 with the standard deviation of 5 and scores are normally distributed. A) what proportion of people passed the test? B) How many have a scores between 80 and 86?
ps. answer all of them please :(
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1. A certain type of radio tubes lasts on the average of 2 years
with the...
A certain type of device lasts on average 6 years with a variance of 4 years....
A certain type of device lasts on average 6 years with a variance of 4 years. assume the device life is normally distributed. find: 1- the probability that the device will lasts between 2 and 3 years 2- the probability that the device will lasts less than 10 years 3- find a value d such that the device life is in the range of 7 ± d with probability of 0.08076 (explain this point carefully)
The board of examiners that administers the real estate brokerʹs examination in a certain state found...
The board of examiners that administers the real estate brokerʹs examination in a certain state found that the mean score on the test was 375 and the standard deviation was 36. If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed
The board of examiners that administers the real estate broker's examination in a certain state found...
The board of examiners that administers the real estate broker's examination in a certain state found that the mean score on the test was 498 and the standard deviation was 72. If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed. O 406 O 570 O 498 439
Please help with steps on how to solve this The mean of the data for the...
Please help with steps on how to solve this The mean of the data for the resting heart rate of adults is 72 beats per minute, and the standard deviation is 5 beats per minute. The results of the data were normally distributed. About what percentage of the population has a resting heart rate between 57 and 72? The mean of normally distributed test scores is 81 and the standard deviation is 5. If there are 246 test scores in...
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a. What ...
all questions. Do not round
answers
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a. What percentage of scores is between 55 and i 15? b. In a group of 20,000 randomly selected individuals, how many have an IQ score of 130 or more? 2. A Honda Civic has its gas mileage (in miles per gallon, or mpg) normally distributed, with a mean of 33 mpg and a standard deviation of...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
QUESTION 22 4 points S The lifetime of a particular type of battery is normally distributed...
QUESTION 22 4 points S The lifetime of a particular type of battery is normally distributed with a mean of 1,100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to K-Mart. What is the probability the average lifetime of these 400 batteries is between 1,097 and 1,104 days? 4 points s QUESTION 23 Graduate students applying for entrance to many universities must take a Miller Analogies Test. It...
assume that adults have it scores that are normally distributed with a mean of 100 Time...
assume that adults have it scores that are normally
distributed with a mean of 100
Time Limit: 02.00.00 mathal.com/Student/Playe Triola, Statistics 13e This Test: 63 pts possible 15 of 50 (11 complete) Test: Test-3-CH-06-07 This Question: 1 pt Assume that adults have 10 scores that are normally distributed with a mean of p = 100 and a standard deviation a = 15. Find the probability that a randomly selected adult has an 10 between 86 and 114 Click to view_page_1...
A set of final examination grades in an introductory statistics course is normally distributed, with a...
A set of final examination grades in an introductory statistics course is normally distributed, with a mean of 73 and a standard deviation of 7. Complete parts (a) through (d). a. What is the probability that a student scored below 86 on this exam? (Round to four decimal places as needed.) b. What is the probability that a student scored between 66 and 93? (Round to four decimal places as needed.) c. The probability is 55% that a student taking...
The board of examiners that administers the real estate broker's examination in a certain state found that the mean score on the test was 498 and the standard deviation was 72. If the board wants to set the passing score so that only the best 80% of all applicants pass, what is the passing score? Assume that the scores are normally distributed. O 406 O 570 O 498 439
all questions. Do not round
answers
1. IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. a. What percentage of scores is between 55 and i 15? b. In a group of 20,000 randomly selected individuals, how many have an IQ score of 130 or more? 2. A Honda Civic has its gas mileage (in miles per gallon, or mpg) normally distributed, with a mean of 33 mpg and a standard deviation of...
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
Question 13 (1 point) Let's look at grades again. Let's say that the grades for a particular test are Normally Distributed with mean=80 and standard deviation = 7. What's the probability that a random student scores a grade between 80 and 90? Op=.3154 p=.842 Op=.4234 Op=.67
QUESTION 22 4 points S The lifetime of a particular type of battery is normally distributed with a mean of 1,100 days and a standard deviation of 80 days. The manufacturer randomly selects 400 batteries of this type and ships them to K-Mart. What is the probability the average lifetime of these 400 batteries is between 1,097 and 1,104 days? 4 points s QUESTION 23 Graduate students applying for entrance to many universities must take a Miller Analogies Test. It...
assume that adults have it scores that are normally
distributed with a mean of 100
Time Limit: 02.00.00 mathal.com/Student/Playe Triola, Statistics 13e This Test: 63 pts possible 15 of 50 (11 complete) Test: Test-3-CH-06-07 This Question: 1 pt Assume that adults have 10 scores that are normally distributed with a mean of p = 100 and a standard deviation a = 15. Find the probability that a randomly selected adult has an 10 between 86 and 114 Click to view_page_1...
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