Question

(5 points) The life of an electric transistor is normally distributed, with a mean of 500 hours and a standard deviation of 80 hours. Determine the probability the transistor wil last more than 400 hours. 3.

Answer 1

Answei Date: 21/03/2019 The probability is that the transistor last more than 400 hours will, First, compute the z score then find probability based on standard normal table. For 400 converts to 400 500 80 From the standard normal distrībution table, the associated probability is 0.1056. Since find the area to the right, so subtract from 1 to get, P(z>1.25) -1- (z<1.25) -1-0.1056 -0.8944 The probability is that the transistorlast more than 400 hours will0.8944