The mean number of minutes for app engagement by a tablet user is 8.2 minutes. Suppose the standard deviationis one minute. Take a sample of size 70.a. What are the mean and standard deviation for the sums?b. Find the 95th percentile for the sum of the sample. Interpret this value in a complete sentence.c. Find the probability that the sum of the sample is at least ten hours. The mean number of minutes for app engagement by a tablet user is 8.2 minutes. Suppose the standard deviationis one minute. Take a sample of size 70.a. What are the mean and standard deviation for the sums?b. Find the 95th percentile for the sum of the sample. Interpret this value in a complete sentence.c. Find the probability that the sum of the sample is at least ten hours.

GivenMean(μ)=8.2standard deviation(σ)=0sample size(n)=70

Answered: The mean number of minutes for app…

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...

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The distribution of the number of hours that a random sample of people spend doing chores per week is shown in the pie chart. Use 32 as the midpoint for "30+ hours." Make a frequency distribution for the data. Then use the table to estimate the sample mean and the sample standard deviation of the data set. Click the icon to view the pie chart. First construct the frequency distribution. Weekly study hours Class Frequency, f 0-4 5-9 0-4 hours (3 people) 10-14 5-9 hours (14 people) 10-14 hours (19 people) 15-19 15-19 hours (21 people) 20-24 20-24 hours (14 people) O 25-29 hours (13 people) 25-29 30+ hours (4 people) 30+ Print Done
A city took a survey of 1,550 households to find out how many televisions each owned. The mean was 2.1 televisions, with a standard deviation of 1.7. What should the researchers do to decrease the margin of error? Answer in complete sentences. UPLOAD WRITER C2
K 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 3%, then the baby is premature. Find the length that separates premature babies from those who are not premature. Click to view page 1 of the table. Click to view page 2 of the table. a. The probability that a pregnancy will last 308 days or longer is (Round to four decimal places as needed.) b. Babies who are born on or before (Round to the nearest integer as needed.) days are considered premature. .
You draw a card from a deck. If you get a red card, you win nothing. If you get a spade, you win $6. For any club, you win $12 plus an extra $20 for the ace of clubs. Find the standard deviation of the amount you might win drawing a card.
Find the range, the standard deviation, and the variance for the given samples. Round non-integer results to the nearest tenth. 80, 82, 78, 45, 58, 52, 99, 86, 73
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The distances golf balls travel under laboratory testing conditions are normally distributed. The mean is 312 yards. The probability the golf ball travels further than 319 yards is 0.28. Find the probability a randomly selected golf ball travels between 305 yards and 319 yards. Express the answer as a decimal value rounded to the nearest hundredth.

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