Question

41. A manufacturer of metal pistons finds that on the average, 12% of his pistons because they are either oversize or undersize. What is the probability that a batch of 10 pistons will contain (a) no more than 2 rejects? (b) at least 2 rejects? 42. In most countries the ratio of boys to girls is about 1.04 to 1. Find the probability that a family in one these countries with exactly 6 children will have at least 3 boys? (Ignore the probability of multiple births.)

these are from study guide could I get work and clarification from either or questions

Answer 1

Que-41 P = 12.= 0.12 io pistons n a We wse Binomial prodbábi uty dushnbutin formla P(x = x P (1- Ca) No more tan a ejeck P(x P(x-0) +PCx= 1 x =2 C-12 (-0412) 1 C2 2(1-0.12o-2 10- 10-o o 12 * (1-0-12 0.8a10 (OKO12 *0-801)(450-12* 0.88 = o.21850097601t 0.3791405819+o. 33043t720 7 o 89 o.891318 20 628 ejets (b) at least Plx2a) P(x=0 +P(x=1 -6-8810(10 0.12'40-88) - (o2185 0091601 o397405819) = ০. 34।+२५१651१ = ०3५2 chegypoby, I have to atled ul 1st Thank Oue to