The average time it takes a group of adults to complete a certain achievement test is 46.2 minutes the standard deviation is 8minutes assume the variable is normally distributed.what is the probability that. A.a randomly selected adult will complete the test in less than 44 minutes? B. if 50 randomly selected adults take the test the meantime it takes the group to complete the test will be less than 44minutes

The average time it takes a group of adults to complete a certain achievement test is 46.2 minutes the standard deviation is 8minutes assume the variable is normally distributed.what is the probability that. A.a randomly selected adult will complete the test in less than 44 minutes? B. if 50 randomly selected adults take the test the meantime it takes the group to complete the test will be less than 44minutes

A First Course in Probability (10th Edition)

10th Edition

ISBN:9780134753119

Author:Sheldon Ross

Publisher:Sheldon Ross

Chapter1: Combinatorial Analysis

Section: Chapter Questions

Problem 1.1P: a. How many different 7-place license plates are possible if the first 2 places are for letters and...

See similar textbooks

Similar questions

The WAIS is an IQ test. Scores on the WAIS for the 20-34 age group are normally distributed with a mean 110 and a standard deviation of 25. Scores for the 60-64 age group are normally distributed with a mean of 90 and a standard deviation of 25. For the age group 60-64, find the probability that a person in this age range scores less than 110. a. 0.7881 b. z= 0.8 or 80% c. 0.2119 or 21.19% d. 16%
Mary drives to work each morning, and the trip takes an average of µ = 38 minutes. The distribution of driving times is approximately normal with a standard deviation of σ = 5 minutes. For a randomly selected morning, which is the probability that Mary’s drive to work will take between 39 and 43 minutes? a. 0.2620 b. 0.4206 c. 0.0793 d. 0.2380
MCAT scores are normally distributed with an average score of 500.5 and a standard deviation of 10.5. Calculate the probability you get a score higher than 521.5 if you take the exam. (Write as a whole number)
Trucks in a delivery fleet travel a mean of 100 miles per day with a standard deviation of 38 miles per day. The mileage per day is distributed normally. Find the probability that a truck drives at least 141 miles in a day. Round your answer to four decimal places.
Midterm exam scores are normally distributed with a mean of 75 and a standard deviation of 6. If the exam is given to 10,000 students, we would expect No one to receive a score of 87 No one to have received a score below 63 Half the scores to fall between 70 and 83 NO Half the scores to fall between 64 and 88 Just over one third of the scores to fall between 75 and 81
Show complete and clear (if it is hand writing) solution and also provide given and illustration if possible. Thank you. explain your answer
pr The lengths of pregnancies are normally distributed with a mean of 269 days and a standard deviation of 15 days. a. Find the probability of a pregnancy lasting 308 days or longer. b. If the length of pregnancy is in the lowest 4%, then the baby is premature. Find the length that separates premature babies from those who are not premature. /2 pr Click to view page 1 of the table. Click to view page 2 of the table. /2 a. The probability that a pregnancy will last 308 days or longer is (Round to four decimal places as needed.) pr b. Babies who are born on or before 12 days are considered premature. (Round to the nearest integer as needed.) /2 12 uc /2 12 or /2 or (2 Enter your answer in each of the answer boxes.
Provide an appropriate response. Use the Standard Normal Table to find the probability. IQ test scores are normally distributed with a mean of 100 and a standard deviation of 15. An individual's IQ score is found to be 90. Find the z-score corresponding to this value. OA. -1.33 OB. 1.33 OC. 0.67 O D. -0.67 C
The SAT scores for students are normally distributed with a mean of 1150 and a standard deviation of 245. What is the probability that a sample of 30 students will have an average score between 1050 and 1120? Round your answer to 3 decimal places. Group of answer choices 0.110 0.565 0.761 0.239 0.890
Trucks in a delivery fleet travel a mean of 100100 miles per day with a standard deviation of 3535 miles per day. The mileage per day is distributed normally. Find the probability that a truck drives less than 148148 miles in a day. Round your answer to four decimal places.
Assume that adults have IQ score that are normally distributed with a mean of 100.4 and a standard deviation of 19.1. Find the probability that a randomly selected adult has an IQ greater than 130.7 (hint draw a graph.) the probability that a randomly selected adult from this group has an IQ greater than 130.7
Please complete B & C thank you!