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Please solve this as soon as possible

Please solve both questions please.

3. Customers arrive at a service facility according to a Poisson distribution at the rate of 3 customers per minute. What is the probability that at least one ctatomer will arrive in any given $30?$ second interval? 4. Let $X$ be a random variable with probability density $f(x)={c(1?x)_{2},0,??1<x<?1dherwise.?$ (a) What is the value of $c$ ? (b) Find the cumulative distribution function. (c) Find $Var(X)$.

3.The probability that at least one customer will arrive in any given 30-second interval is given by 1 - P(0 customers