91影视

(a).

100 raffle tickets deals for$\$5$all.

You buy 4 tickets

Prize is two passes to a Broadway show worth total$\$150.$

Interpretation:

As per the questions the most important thing is net profit, if we buy 4 raffle tickets what the net profit will is should be our main concern.

(b).

Given:

100 truck tickets deals for$\$5$all. You buy 4 tickets

Prize is two passes to a Broadway show worth total$\$150$.

Interpretation:

In this question,$X$is a arbitrary variable which defines the net profit earned by copping the 4 truck tickets. There are 2 possibilities$-20$when person doesn't win the prize and $130$when person wins the prize.

(C)

Interpretation :$X$can take only 2 values$-20$and 130 because there are 2 possibilities$-20$when person does not win the prize and 130 when person wins the prize.

(D).

Interpretation: $X$can take only 2 values$-20$and 130 because there are 2 possibilities $-20$when person does not win the prize and $130$when person wins the prize. To get probabilities we have used the formula $P(X=x)=\frac{n!}{x!(n-x)!}脳p^x脳(1-p{)}^{n-x}$

(E).

Interpretation:

The expected average earning is $-14$which we have got by using the formula.$E\left(x\right)=\underset{}{\overset{}{鈭�}}[x.P(x\left)\right]$.