A company builds 3,000 PCs. The lifetimes of the PCs are approximately normally distributed with a mean of 500 weeks and a standard deviation of 100 weeks. Find the approximate number of PCs that can be expected to last the time given below 23) more than 300 weeks A) 2,931 B) 1,431 C) 69 D) 1500 23) Use the regression line to predict the value of y. 24) Nine pairs of data yield the regression equation y - 19.4+0.93x. What is the best predicted value of 24) y for x = 437 A) 57.8 B) 59.4 79.6 D) 64.7