Question

Mary sells fancy cakes through the internet at 50 euros each. Let R be the number ofcakes that she sells within 24 hours of the time that she posts the cake on the internet.R is a binomial random variable with q=0.28. Today she will bake 5 cakes and she will post them on the internet at the same time. Find the probability that Mary will sell less than 2 of these 5 cakes within 24 hours of the time that she posts them on the internet

Answer 1

R :  the number of cakes that she sells within 24 hours of the time that she posts the cake on the internet.

R ~ bin (n,p)

where, n = 5

q = 0.28

p = (1-q) = (1-0.28) = 0.72

the pmf of the distribution be:-

the probability that Mary will sell less than 2 of these 5 cakes within 24 hours of the time that she posts them on the internet is:-

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