The weights of 1,000 men in a certain town follow a normal distribution with a mean of 150 pounds and a standard deviation of 15 pounds.
2 answers:
68% fall within +/- 1 SD, so men above that 1 SD (165) are: (100-68)/2
Answer:
Step-by-step explanation:
Let X be the weights of 1000 men in a certain town.
Given that X is N(150, 15)
P(X>165) = P(Z>1) =0.5-0.3413 = 0.1687
No of men weighing more than 165 pounds in 1000 men = 1000(0.1687)
=168.7 =169 men apprxy.
Similarly
P(X<135) = P(Z<2)=0.5-0.4775 = 0.0225
No of men weighing less than 135 pounds is about =0.0225(1000)
= 22.5
=22
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