Question 1177176
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Hi
Binomial Distribution: p(strike) = .30   n = 12
Using TI or similarly an inexpensive calculator like a Casio fx-115 ES plus 

a. no major strikes  = binompdf(n, p, x-value). = binompdf(12, .30,0) = .0138

b. P(at least 5) = P(x≥5) =  1 - P(x≤ 4) = 1-binomcdf(12, .30, 4) =1 - .7237 = .2763

c. between 2 and 4 inclusive (that is 2, 3, or 4). = P(2) + P(3) = P(4) - 
P(2) + P(3) + P(4) = .1678 + .2397 + .2311

d. Determine the mean and variance of the number of strikes next year.
  Mean = np = 12*.30 = 3.6
 Variance = np(1-p) = 3.6(.70) = 2.52

Wish You the Best in your Studies.
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