A company that makes hair-care products had 7,000 people try a new shampoo. Of the 7,000 people, 56 had a mild allergic reaction. What percent of the people had a mild allergic reaction?

The random variable x has probability density function f (x) = k(−x²+5x−4) 1 ≤ x ≤ 4 or =0 1 show that k = 2/9 find 2 e(x), 3 the mode of x, 4 the cumulative distribution function f(x) for all x. 5 evaluate p(x ≤ 2.5). 6 deduce the value of the median and comment on the shape of the distribution.