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Solution4b

# Solution4b - Stat 350 Homework#4 Solution 49(a n = 16 = 12...

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Stat 350 Homework #4 Solution 49. (a) n = 16, = 12 and = .04, so P(11.99 x 12.01) = P( 16 04 . 12 01 . 12 16 04 . 12 99 . 11 z ) = P(-1 z 1) = .8413 - .1587 = .6826. (b) n = 64, = 12 and = .04, so P(11.99 x 12.01) = P( 64 04 . 12 01 . 12 64 04 . 12 99 . 11 z ) = P(-2 z 2) = .9772 - .0228 = .9544. 50. (a) x = the weight of a bag of fertilizer = 50 lbs = 1 lb n = 100 9876 . 0062 . 9938 . 5 . 2 5 . 2 5 . 2 5 . 2 100 1 50 25 . 50 100 1 50 75 . 49 25 . 50 75 . 49 z P z P z P z P x P (b) = 49.8 lbs = 1 lb n = 100 6915 . 3085 . 1 5 . 0 5 . 4 5 . 4 5 . 0 25 . 50 75 . 49 z P z P z P x P 52. x = Rockwell hardness = 50 = 1.5 (a) When n = 9, 0 4 9 5 . 1 50 52 52 z P z P x P (b) When n = 40, 0 43 . 8 52 z P x P

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54. (a)          35 . 05 . 3 05 . 2 1 . 1 8 . 0 ) ( x xp
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Solution4b - Stat 350 Homework#4 Solution 49(a n = 16 = 12...

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