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 were obtained on a typical day. researchers found that visually impaired students averaged 9.87 hours of sleep, with a standard deviation of 1.1 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 6.1 hours of sleep?
b. what is the probability that a visually impaired student gets between 6.5 and 7.89 hours of sleep?

a) 0.0003

b) 0.035      

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 9.87 hours

Standard Deviation, σ =  1.1 hours

We are given that the distribution of hours of sleep is a bell shaped distribution that is a normal distribution.

Formula:

a) P(student gets less than 6.1 hours of sleep)

P(x < 6.1)

Calculation the value from standard normal z table, we have,  

c)P(student gets between 6.5 and 7.89 hours of sleep)

answer: the sun

explanation:

water cycle describes the evaporation of water from earth's surface, formation of clouds and precipitation water back onto the surface of earth. seventy percent of the earth is covered with water in the form of seas and oceans. the heat of the sun causes the evaporation of water from the surface of the ocean. the water vapors rise and condense to form water droplets. the collection of these water droplets form clouds which rain down again.

the evaporation of the oceans surface water as part of the water cycle is caused by the sun