In a parking lot there630 cars 270 convertibles 360 minivans what is the ratio of cards to convertibles reduce your fraction to the lowest term

Pls! does anybody know a shortcut for answering these types of questions in the future?

Answer pls man im trying to get out of summer school

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.