Triangle abc has sides that are 5,6, and 7. triangle def has sides that are 3.75, x, and 5.25. find the middle side of triangle def, then find the perimeter of triangle def.

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.