Question 1026287
*[illustration normal67.gif]

a) 68% is within 1 std dev - so between 60 and 80 mph
b) 99.7% is 3 std dev - so between 40 and 100 mph

I'm sorry, not familiar with the warning for c and d. You can still copy the question and resubmit. I appreciate your response, but I'd not have answered this if I saw the full question first.