1 answer

Need help with this question. Thank you :) 1. A host gives a scratchie to each...

Question:

Need help with this question. Thank you :)
1. A host gives a scratchie to each of the 100 guests at his party. Each scratchie has probability p of winning some prize in
1. A host gives a scratchie to each of the 100 guests at his party. Each scratchie has probability p of winning some prize independent of the others) (a) What is the probability that exactly 10 guests win a prize? (b) What is the expected number of guests who win a prize? (c) What is the probability that at least 3 guests win priz Make your final answer a reasonably short expression that does not use sigma notation Answer only required for (a) and (b), short explanation required for (c)] [6)

Answers

(a)

Binomial Distribution:

n = Number of trials = 100

p = Probability of success in a single trial = p

So,

q = 1 - p

× (1-p)90 × p10-1.7310 × 1013 × (1-p)90 × p10 P(X-10) =

So,

Answer is:

1.7310 × 1013 × (1-2)90 × p10

(b)

Expected Number = n p = 100 p

So,

Answer is:

100 p

(c)

P(X\geq3) = 1 - [P(X =0) + P(X = 1) + P(X = 2)]

100

x (1-p)99 x pi = 100 × (1-p)99 × p = 100(1-p)99p

100

So

P(X > 3) = 1-1(1-p)100 + 100(1 _ p)99p +4950(1-p)98p2

.

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