Serum cholesterol levels were taken from a college students. The results were no

Question

Serum cholesterol levels were taken from a college students. The results were normally distributed. Males had mean of 195 and a standard deviation of 10. Females had mean of 185 and a standard deviation of 12. What cholesterol level must a male have to be in the highest 5%? a. 196.3 b. 209.45 c. 215 d. 211.45 The height of an ad male is known to be normally distributed with a mean of 175 cm and a standard deviation of 6 cm. The 20th percentile of the distribution of heights is: a. 179 cm b. 175 cm c. 172 cm d. 174 cm e. 170 cm Lice are a pesky problem for school aged children and is unrelated to cleanliness. The lifetimes of ice that have fallen off the scalp onto bedding is approximately normally distributed 2.2 days and a standard deviation of 0.4 days. We would expect that approximately 90% of the ice would die within about. a 39 days b. 3.0 days c. 27 days d. 2.5 days e. 2.6 days

Explanation / Answer

Q4) Higher 5%

X = 1.645*10+195

X = 211.45

Option D is Correct

q5) 20th Percentile = -0.84162*6+175 = 170

Option E is Correct

Q6) X= 1.2816*0.4+2.2 = 2.7

Option C is Correct

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