The final exam scores in freshman English at a large high school are normally distributed with a mean of 84% and a standard devi
1 answer:
Answer: A. 103
Step-by-step explanation:
Given : The final exam scores in freshman English at a large high school are normally distributed with a mean of 84% and a standard deviation of 14%.
i.e. and
Let x be the exam scores in freshman English ( in percent ).
Then, the probability that students scored between 70% and 80% would be
If 450 students took the exam, then the number of students scored between 70% and 80% = 450 x ( probability that students scored between 70% and 80%)
= 450 x 0.2289=103.005≈ 103
Therefore , About 103 students scored between 70% and 80% .
Hence, the correct answer is A. 103 .
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