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find the mean (average) of the data set below? 2/4 18/5 28/10 5/20

Sagot :

reinhard10158

Step-by-step explanation:

sum of numbers divided by how many numbers there are.

(2/4 + 18/5 + 28/10 + 5/20)/4

we bring all fractions to .../20, as 20 is the smallest common multiple of all denominators. and then we can easily sum them all up.

so,

(10/20 + 72/20 + 56/20 + 5/20)/4 =

143/20 / 4 = 143/20 × 1/4 =

= 143/80 is the mean or average

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