Suppose the life of a particular brand of laptop battery is normally distributed with a mean of 8 hours and a standard deviation of 0.6 hours.What is the probability that the battery will last more than 9 hours before running out of power?
A) 0.0475
B) 0.4525
C) 0.9525
D) 1.6667

Question

Quizplus · Accepted Answer

The probability can be found using the Z-score formula: Z = (X - μ) / σ. For X = 9, μ = 8, and σ = 0.6, Z = (9 - 8) / 0.6 = 1.67. Using a standard normal distribution table, the probability of Z > 1.67 is approximately 0.0475.

Suppose the Life of a Particular Brand of Laptop Battery