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3 years ago

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The grades on the last history exam had a mean of 75%. Assume the population of grades on history exams is known to be normally

distributed with a standard deviation of 7. What percent of students earn a score between 70% and 82%?

1 answer:

RUDIKE [14]3 years ago

6 0

34% . <span>Since going from 75% to 82% is simply the right portion of that middle, the answer is half of 68%, or 34%.</span>

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Read 2 more answers

It take Sophia 1/5 weeks to read one book and Sophia reads for 1/6 weeks how many books where she read

ladessa [460]

Sophia has not even completed 1 book. She has managed to complete 83% of the book.

<u>Explanation:</u>

Given:

Time taken to read one book = 1/5

Total weeks for which sophia read = 1/6

Number of books, z = ?

Total weeks = z X time taken to read one book

$\frac{1}{6} = z X \frac{1}{5} \\\\z = \frac{5}{6} \\\\z = 0.83$

Therefore, sophia has not even completed 1 book. She has managed to complete 83% of the book.

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