21. The life of a drill bit has a mean of 16 hours and a standard deviation of 2-6 hours. Assuming a normal distribution, determine the probability of a sample bit lasting for i. more than 20 hours, ii. less than 14 hours.

21. The life of a drill bit has a mean of 16 hours and a standard deviation of 2-6 hours. Assuming a normal distribution, determine the probability of a sample bit lasting for i. more than 20 hours, ii. less than 14 hours.

Calculus For The Life Sciences

2nd Edition

ISBN:9780321964038

Author:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Publisher:GREENWELL, Raymond N., RITCHEY, Nathan P., Lial, Margaret L.

Chapter13: Probability And Calculus

Section13.3: Special Probability Density Functions

Problem 8E

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Question

statistic

normal distribution

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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