College students from engineering and science colleges were surveyed and ask are
ID: 3218484 • Letter: C
Question
College students from engineering and science colleges were surveyed and ask are in a The hours a they spent 5 to 10 hours More than 10 Hours Find the Total spends more than 10 hours for studying given probability that randomly selected student the student an a engineering college. The owner of a small newspaper kiosk orders copies of a certain specialty magazine for iti^ck each week. Let V=weekly demand for the specialty magazine with probability mass function. What is the probability of selling at least one magazine? What is the expected value and the variance of the number of magazines that will be sold in a week? Assume that each magazine costs the owner $20 and he can sell each of them for $40 If he orders magazines at the beginning of a week, what is his expected profit from selling them?Explanation / Answer
5) probability =16/49=0.3265
6)a) P(Y>=1)=P(Y=1)+P(Y=2)+P(Y=3)=0.35+0.45+0.10=0.90
E(Y) =1.55
Var(Y)=3.05-1.552 =0.6475
in last part magazine portion is not visible
y P(y) yP(y) y^2P(y) 0 0.1 0 0 1 0.35 0.35 0.35 2 0.45 0.9 1.8 3 0.1 0.3 0.9 total 1 1.55 3.05