Which expression is equivalent to −1.3+(−4.9)+(−2.6) ?

−(1.3−4.9)+(−2.6)

−1.3−(4.9+2.6)

−1.3+(4.9+2.6)

(1.3+4.9+2.6)

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.