# Find the Mean (Arithmetic) 2/3 , 4/5

23 , 45
The mean of a set of numbers is the sum divided by the number of terms.
23+452
Simplify the numerator.
To write 23 as a fraction with a common denominator, multiply by 55.
23⋅55+452
To write 45 as a fraction with a common denominator, multiply by 33.
23⋅55+45⋅332
Write each expression with a common denominator of 15, by multiplying each by an appropriate factor of 1.
Multiply 23 and 55.
2⋅53⋅5+45⋅332
Multiply 3 by 5.
2⋅515+45⋅332
Multiply 45 and 33.
2⋅515+4⋅35⋅32
Multiply 5 by 3.
2⋅515+4⋅3152
2⋅515+4⋅3152
Combine the numerators over the common denominator.
2⋅5+4⋅3152
Simplify the numerator.
Multiply 2 by 5.
10+4⋅3152
Multiply 4 by 3.
10+12152
Add 10 and 12.
22152
22152
22152
Multiply the numerator by the reciprocal of the denominator.
2215⋅12
Cancel the common factor of 2.
Factor 2 out of 22.
2(11)15⋅12
Cancel the common factor.
2⋅1115⋅12
Rewrite the expression.
1115
1115
Divide.
0.73‾
The mean should be rounded to one more decimal place than the original data. If the original data were mixed, round to one decimal place more than the least precise.
0.7
Find the Mean (Arithmetic) 2/3 , 4/5

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