the percentage of scores between 90 and 120 is

The mean of a set of numbers is the sum divided by the number of terms.

90+1202

Factor 2 out of 90.

2⋅45+1202

Factor 2 out of 120.

2⋅45+2⋅602

Factor 2 out of 2⋅45+2⋅60.

2⋅(45+60)2

Cancel the common factors.

Factor 2 out of 2.

2⋅(45+60)2(1)

Cancel the common factor.

2⋅(45+60)2⋅1

Rewrite the expression.

45+601

Divide 45+60 by 1.

45+60

45+60

45+60

Add 45 and 60.

105

Find the Mean (Arithmetic) the percentage of scores between 90 and 120 is