3] If the p. d.f., of the random variable X is given by f(x)= K/sqrt x &0 otherwise

(c) P(|X| < 3)

(d) E(2X - 2)

(e) V(3X)

3/20

step-by-step explanation:

well, there are 20 outcomes, and 3 of them you want. so, 3/20

beth buys 10 x shirts and still has more than 100 in her account

step-by-step explanation:

total income = price of one ticket   *   number of tickets sold

  y                 =     4                                   x

so the equation is y=4x     with x≥0   because number of tickets sold can not be negative

thus the equation is a semi -line with an end point at

(0,0)

passing through :

x=1     y=4(1) = 4   so through (1,4)