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Section 7.2 Homework Question 11
Section 7.2 Homework
11.
hours and a standard deviation of
hours. With this information, answer the following questions.
hours?
hours or less?
and
hours?
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