Part 2

Question 12 of 12 (1 point) | Attempt 1 of Unlimited View question in a popup 7.1 Section Exercise 51 Lifetime of electronics: In a simple random sample of 100 electronic components produced by a certain method, the mean lifetime was 125 hours. Assume that component lifetimes are normally distributed with population standard deviation o = 20 hours. Round the critical value to no less than three decimal places. EO Part 1 of 2 (a) Construct a 90% confidence interval for the mean battery life. Round the answer to the nearest whole number. A 90% confidence interval for the mean battery life is 122