Which function is the inverse function of f(x) = 3x - 77
OA
f-1(x) = 3(x + 7)
$-+(x) = 2+7
3
OC
f-1(x) = x + 1
OD
f-1(x) = 1 +7

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.