Simple interest on Rs 3500 at 10% per annum for a certain period is Rs 400 more than the interest on Rs 2500 at 10% peo annum for the same same period. find the time ​

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.