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 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 less than 6.6 hours of sleep? (b) What is the probability that a visually impaired student gets between 6 and 8.56 hours of sleep? (c) Fourty percent of students get less than how many hours of sleep on a typical day?

Answer #1

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 8.28 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 8.85 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...

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...

(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...

These tests are intended for undergraduate students in
college or those under 18 years of age.
Read these directions carefully!
The below test includes 10 questions, randomly selected from a
large inventory. Most questions will be different each time you
take the test,
You must answer at least 9 out of 10 questions correctly to
receive your Certificate.
You have 40 minutes to complete each test, and you must answer
all 10 questions in order to to see your results....

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