Scores from an exam are normally distributed with a mean of 85 and a standard deviation of 5. suppose 188 students take the exam. about how many would receive a score above 80? 158 students 60 students 122 students 153 students

The mean is and standard deviation is . Then the variable .

Use substitution , then the variable .

The probability can be calculated in the following way:

for X=80, and . From the diagram .

Conclusion: if 188 students take the exam, then 188·0.84=157.92 (157) would receive a score above 80

answer

the correct answer is

explanation

the given function is

the excluded values are obtained by solving:

we factor to obtain:

the excluded values are

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

you.