26. Use the information below to sketch a graph of the polynomial function y = f(x). SEE EXAMPLE 4
• f(x) is positive on the intervals (-00,-3), (-2, 0),
and (2, 3).
• f(x) is negative on the intervals (-3, -2), (0, 2),
and (3, 00).
• f(x) is increasing on the interval (-2.67, -1)
and (1, 2.5).
• f(x) is decreasing on the intervals (-00, -2.67),
(-1, 1), and (2.5, -0).

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.