Navigation » List of Schools, Subjects, and Courses » Math 136 – Introduction to Statistics » Section 7.2 Homework » Section 7.2 Homework Question 11 » Section 7.2 Homework Question 11 Sample Answers
We are showing you only the excerpt of our answer. If you need help with the complete answer email us at 
Section 7.2 Homework
11.
Suppose that the lifetimes of light bulbs are approximately normally distributed, with a mean of
hours and a standard deviation of
hours. With this information, answer the following questions.
(a) What proportion of light bulbs will last more than
hours?
(b) What proportion of light bulbs will last
hours or less?
(c) What proportion of light bulbs will last between
and
hours?
(d) What is the probability that a randomly selected light bulb lasts less than
hours?
(a) The proportion of light bulbs that last more than 61 hours is
(b) The proportion of light bulbs that last 52 hours or less is
(c) The proportion of light bulbs that lasts between 57 and 62 hours is
(d) The probability that a randomly selected light bulbs lasts less than 46 hours is
null
This question is taken from Math 136 – Introduction to Statistics » Summer 2021 » Section 7.2 Homework