statistic normal distribution 23. Telephone calls from an office are monitored and found to have a mean duration ofand a standard deviation of 123 s. Determinei. the probability of the length of a call being between 300 s and 480 s.ii. the proportion of calls likely to last for more than 720 s.24. Light bulbs, having a mean life of 2400 hours and standard deviation of 62 hours,for a consignment of 4000 bulbs. Determinei. the number of bulbs likely to have a life in excess of 2500 hours

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Answered: 24. Light bulbs, having a mean life of…

MATLAB: An Introduction with Applications

6th Edition

ISBN:9781119256830

Author:Amos Gilat

Publisher:Amos Gilat

Chapter1: Starting With Matlab

Section: Chapter Questions

Problem 1P

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statistic

normal distribution

23. Telephone calls from an office are monitored and found to have a mean duration of
and a standard deviation of 123 s. Determine
i. the probability of the length of a call being between 300 s and 480 s.
ii. the proportion of calls likely to last for more than 720 s.
24. Light bulbs, having a mean life of 2400 hours and standard deviation of 62 hours,
for a consignment of 4000 bulbs. Determine
i. the number of bulbs likely to have a life in excess of 2500 hours

Features Features Normal distribution is characterized by two parameters, mean (µ) and standard deviation (σ). When graphed, the mean represents the center of the bell curve and the graph is perfectly symmetric about the center. The mean, median, and mode are all equal for a normal distribution. The standard deviation measures the data's spread from the center. The higher the standard deviation, the more the data is spread out and the flatter the bell curve looks. Variance is another commonly used measure of the spread of the distribution and is equal to the square of the standard deviation.

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