Write an equation for the following scenario. To join a gym you need to give a down payment of 20 dollars and then pay 10 dollars a month. Let y represent the total cost and x represent the months. I will give

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.