A gray-scale digital camera with 1,000,000 pixels takes a picture (the picture is made of 1,000,000 parts and each part has a certain amount of gray). A histogram is made where the data is the amount of gray in each of these parts. The histogram looks bell-shaped with a mean of 125 gray levels and a standard deviation of 15.

How many pixels are brighter than 163 gray levels?

5000
10,000
160,000
50,000

Question

A gray-scale digital camera with 1,000,000 pixels takes a picture (the picture is made of 1,000,000 parts and each part has a certain amount of gray). A histogram is made where the data is the amount of gray in each of these parts. The histogram looks bell-shaped with a mean of 125 gray levels and a standard deviation of 15.

How many pixels are brighter than 163 gray levels?

5000
10,000
160,000
50,000

anonymous · Answer

@dan815 help please

anonymous · Answer

oe can someone help

dan815 · Answer

125 +k *15= 163 
k is telling you the number of standard deviations above you need to go to get 163

dan815 · Answer

usually they call that K as Z and say its the Z score

dan815 · Answer

38/15 = Z score
a little higher than 2.5 lets say

dan815 · Answer

look at a z table and see what probability that z score is use a calculator 38/15

anonymous · Answer

@dan815 what would i type in calculator