Question

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 9.83 hours of sleep, with a standard deviation of 2.02 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 6.9 hours of sleep?

(b) What is the probability that a visually impaired student gets between 6.7 and 9.09 hours of sleep?

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

(I have many questions similar to this, please be as thorough as possible, especially on b and c)

Answer #1

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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 8.28 hours of sleep, with a standard deviation of
1.9 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...

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 8.9 hours of sleep, with a standard deviation of
2.37 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...

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 8.38 hours of sleep, with a standard deviation of
2.76 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...

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 8.85 hours of sleep, with a standard deviation of
2.19 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...

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 9.649.64 hours of sleep, with a standard
deviation of 2.282.28 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...

(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 8.4 hours of sleep, with a
standard deviation of 1.91 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...

A journal published a study of the lifestyles of visually
impaired students. Using diaries, the students kept track of
several variables, including number of hours of sleep obtained in a
typical day. These visually impaired students had a mean of
8.85 hours and a standard deviation of 2.13
hours. Assume that the distribution of the number of hours of
sleep for this group of students is approximately normal. Complete
parts a through c.
a. Find
P(x> 12)=0.0694
(Round to four...

(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...

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