Chapter 6.4, Problem 30E

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10th Edition

Ron Larson

ISBN: 9781305860919

Textbook Problem

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Quality Control A company manufactures compact fluorescent light bulbs. The life spans of the light bulbs are normally distributed with a mean of 9000 hours and a standard deviation of 500 hours. Use a symbolic integration utility or a graphing utility to find the probability that a light bulb chosen at random has a life span that is

(a) 8000 hours or longer.

(b) 11,000 hours or longer.

**(a)**

To determine

**To calculate:** The probability of fluorescent bulb which has life longer than

Explanation

**Given Information:**

The mean life of the fluorescent light bulb is

**Calculation:**

Use excel to find the probability. Steps to use excel is as follows:

Step 1: Add the function “NORM.DIST” in the excel.

Step 2: Add the values of the “x”, mean, standard deviation and cumulative as “=NORM.DIST(8000,9000,500, TRUE)” in the cell as shown in the below snip.

Step 3: Once you press enter, the result is obtained as the results for the

Therefore, the probability for

**(b)**

To determine

The probability of fluorescent bulb which has life longer then

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