Answer Happy

Posted: **Thu Apr 28, 2022 7:45 am**

: A To Determine The Average Speed Of Cars Along A Certain Road A Random Sample Of 100 Cars Is Taken And The Mean Speed 1 (17.85 KiB) Viewed 31 times

(a) To determine the average speed of cars along a certain road, a random sample of 100 cars is taken and the mean speed in the sample is found to be 58.4 mph. If the true standard deviation of the speeds is known to be 15 mph, find a 95% confidence interval for y, the true average speed.