Question

(1 point) Healty people have body temperatures that are normally distributed with a mean of 98.20∘F and a standard deviation of 0.62∘F . (a) If a healthy person is randomly selected, what is the probability that he or she has a temperature above 99.5∘F? answer: (b) A hospital wants to select a minimum temperature for requiring further medical tests. What should that temperature be, if we want only 1.5 % of healty people to exceed it? answer:

(1 point) Using diaries for many weeks, a study on the lifestyles of visually impaired students was conducted. The students kept track of many lifestyle variables including how many hours of sleep obtained on a typical day. Researchers found that visually impaired students averaged 8.48.4 hours of sleep, with a standard deviation of 1.911.91 hours. Assume that the number of hours of sleep for these visually impaired students is normally distributed.

(a)  What is the probability that a visually impaired student gets less than 6.86.8 hours of sleep?

answer:

(b)  What is the probability that a visually impaired student gets between 6.66.6 and 10.7110.71 hours of sleep?

answer:

(c)  Twenty percent of students get less than how many hours of sleep on a typical day?

answer:  hours

Answer 1

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