The scores on a college entrance exam is 100 with

Ella Bradshaw

Ella Bradshaw

Answered question

2022-01-27

The scores on a college entrance exam is 100 with a standard deviation of 7.5. How do you find the probability that a randomly selected score is between 85 and 100?

Answer & Explanation

lirwerwammete9t

lirwerwammete9t

Beginner2022-01-28Added 9 answers

Explanation:
Asumming that the distribution is normal, let us find the z score of 85 and 100.
As μ=100 and σ=7.5
z-score is given by xμσ
Hence for 85z z-scorre is 851007.5=157.5=2
and for 100, z-scorre is 1001007.5=0
Hence area between -2 and 0 from tables is 0.4772
and probability is 47.72%

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