Question

The average on the Algebra II final exam wasa 74% with a standard deviation of 5%. Ifthere were 200 students who took the test,approximately how many of the studentsscored at least an 85%?

Answer 1

The average on the Algebra II final exam was

a 74% with a standard deviation of 5%. If

there were 200 students who took the test,

approximately how many of the students

scored at least an 85%?

step 1

Find out the z-score

z=(85-74)/5

z=2.2

using a z-score calculator

please wait a minute

P=0.013903 -------> P=1.3903%

so

For 200 students

200*0.013903=2.78 students

therefore

answer is

approximately 3 students