Question

1. (a) The time needed to complete a final examination in a particular college course is...

1. (a) The time needed to complete a final examination in a particular college course is normally distribution with a mean of 80 minutes and a standard deviation of 10 minutes. What is the probability that a student will complete the exam between 60 and 100 minutes?

1 (b) The mean preparation fee H&R Block charged retail customers last year was $183. Use this price as the population mean and assume the population standard deviation of preparation fees is $50. What is the probability that the mean price for a sample of 50 H&R Block retail customers is within $8 of the population mean?

Homework Answers

Answer #1

1.

a)

μ=80, σ=10

We need to compute Pr(60≤X≤100).

The corresponding z-values =

Therefore, we get:

b)

μ=183, σ=50, n=50

We need to compute prob of probability that the mean price for a sample of 50 H&R Block retail customers is within $8 of the population mean which means between183 - 8 and 183 + 8 .ie.175 and 191.

Pr(175≤Xˉ≤191). The corresponding z-values needed to be computed are:

Therefore, the following is obtained:

please like )

Know the answer?
Your Answer:

Post as a guest

Your Name:

What's your source?

Earn Coins

Coins can be redeemed for fabulous gifts.

Not the answer you're looking for?
Ask your own homework help question
Similar Questions
11) The time needed to complete a final examination in a particular college course is normally...
11) The time needed to complete a final examination in a particular college course is normally distributed with a mean of 90 minutes and a standard deviation of 15 minutes. Answer the following questions. a. What is the probability of completing the exam in one hour or less? b. What is the probability that a student will complete the exam in more than 60 minutes but less than 105 minutes? c. Assume that the class has 60 students and that...
The time needed to complete a final examination in a particular college course is normally distributed...
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 77 minutes and a standard deviation of 12 minutes. Answer the following questions. a. what is the probability of completing the exam in one hour or less (to 4 decimals) b. what is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes (to 4 decimals) c. assume that the class...
The time needed to complete a final examination in a particular college course is normally distributed...
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. If students have only 100 minutes to complete the exam, what percentage of the class will not finish the exam in time?
The time needed to complete a final examination in a particular college course is normally distributed...
The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions. (a) What is the probability of completing the exam in one hour or less? (Round your answer to four decimal places.) (b) What is the probability that a student will complete the exam in more than 60 minutes but less than 75 minutes? (Round your answer to...
he time needed to complete a final examination in a particular college course is normally distributed...
he time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions. (a) What is the probability of completing the exam in one hour or less? (Round your answer to four decimal places.) (b) What is the probability that a student will complete the exam in more than 60 minutes but less than 65 minutes? (Round your answer to...
(4pt) The time needed to complete a final examination in college in the United States is...
(4pt) The time needed to complete a final examination in college in the United States is normally distributed with a mean of 90 minutes and standard deviation of 10 minutes. (2pt) What is the probability of completing a final exam in more than 100 minutes? Answer: (2pt) What is the probability of finishing a final examination between 60 to 120 minutes? Answer:
The time needed to complete a final quiz in a particular college course is normally distributed...
The time needed to complete a final quiz in a particular college course is normally distributed with a mean of 77 minutes and a standard deviation of 12 minutes. Answer the following questions. a. What is the probability of completing the quiz in one hour or less (to 4 decimals)? b. What is the probability that a student will complete the quiz in more than 60 minutes but less than 75 minutes (to 4 decimals)? c. Assume that the class...
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 77 and a standard deviation of 7 complete parts a through d. a. what is the probability that a student scored below 89 on this exam b. what is the probability that a student scored between 70 and 93 c. the probability is 15% that a student taking the test scores higher than what grade d. if the professor grades on a...
The mean preparation fee H&R Block charged for taxes in 2012 was $183. Use this price...
The mean preparation fee H&R Block charged for taxes in 2012 was $183. Use this price as a population mean and assume the SD of the population is $50. a) What is the probability that the mean price for a sample of 30 H&R Block customer is within $8 of the population mean? b) What is the probability that the mean price for a sample of 50 H&R Block customer is within $8 of the population mean? c). What is...
You may need to use the appropriate appendix table to answer this question. The time needed...
You may need to use the appropriate appendix table to answer this question. The time needed to complete a final examination in a particular college course is normally distributed with a mean of 80 minutes and a standard deviation of 10 minutes. Answer the following questions. (a)What is the probability of completing the exam in one hour or less? (Round your answer to four decimal places.) (b)What is the probability that a student will complete the exam in more than...