8. Driving at an average rate of 50 miles per hour, John reached his destination in exactly 2 hours and 30 minutes. To drive the same route in exactly 2 hours, John would have to
average what rate of speed?

Assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.assume that adults have iq scores that are normally distributed with a mean of mu equals 100 and a standard deviation sigma equals 20. find the probability that a randomly selected adult has an iq between 80 and 120.