It is known that college student sleep an average of 6 hours per night with a standard deviation equal to 1.8

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It is known that college student sleep an average of 6 hours per night with a standard deviation equal to 1.8

[From: ] [author: ] [Date: 11-12-26] [Hit: ]

we get Z = 0.84.w = 6 + (0.84) * 1.8 = 7.Sounds like my engineering days.......

a student is selected at random.
approximately 80% of college students sleep less than "w" hours per night. what is the value of w

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We're looking for Z such that:

P(Z) < 0.8

From a Z-table, we get Z = 0.84. So the answer is:

w = 6 + (0.84) * 1.8 = 7.5 hours of sleep

Sounds like my engineering days...

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Find the z-score a that has the area to the left of is equal to 0.8.

P(z
Use the formula z=(x-饾泹)/饾潏
0.84=(w-8)/1.8

0.84(1.8) + 8 = w

w鈮?.51

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Its good to be clever, but not to show it.

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