The results of a test are normally distributed with a mean of 80 and standard deviation of 5:
a) between 75 and 85 = % (round to nearest whole number)
b) betwwn 70 and 90 = % (round to nearest whole number)
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Answer:
1/2
Step-by-step explanation:
a. Between 75 and 85
= 76, 77, 78, 79, 80, 81, 82, 83, 84, 85
10 Numbers -------1
b. Between 70 and 90
= 71, 72, 73 74, 75, 76, 77, 78, 79, 80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90
20 Numbers ---------2
In dividing equation 2 from equation 1
=10/20
=1/2
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