20. (Follow-on from Q19)Suppose now a sample of 9 toys is chosen. What is the probability that the sample mean is less than 16 hours?O 0.0350.0360.0370.0380.039 18. If the random variable X follows a binomial distribution where n=5 and p=0.2, what is Var(X)?O 1.00.80.60.50.219. Battery-life of a new line of toys can be modelled using a normal distribution, with a mean of 17.3 hours, and a standard deviation of 2.2 hours.If a toy is chosen randomly, what is the probability that it's battery-life is less than 15 hours?0.1480.1500.152O 0.1540.156

Answered: Image /qna-images/answer/379e3c7e-3b75-4d3f-a338-e82b01708230.jpg

Answered: O 0.036 O 0.037 O 0.038 O 0.039

Math

Probability

O 0.036 O 0.037 O 0.038 O 0.039

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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Question

20. (Follow-on from Q19)
Suppose now a sample of 9 toys is chosen. What is the probability that the sample mean is less than 16 hours?
O 0.035
0.036
0.037
0.038
0.039

18. If the random variable X follows a binomial distribution where n=5 and p=0.2, what is Var(X)?
O 1.0
0.8
0.6
0.5
0.2
19. Battery-life of a new line of toys can be modelled using a normal distribution, with a mean of 17.3 hours, and a standard deviation of 2.2 hours.
If a toy is chosen randomly, what is the probability that it's battery-life is less than 15 hours?
0.148
0.150
0.152
O 0.154
0.156

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