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3 years ago

I need help on 11 plz I need a slot of help

Mathematics

1 answer:

Galina-37 [17]3 years ago

8 0

mean = (sum of values) / (number of values)

we know mean is 13 and we are given 8 values. The ninth value is the missing x:

13 = ((sum of 8 values) + x)/9

13 = (12+10+15+12+13+15+11+15+x)/9

13*9 = 103+x

x = 14

The missing value is 14. There are 14 pillows in the last box.

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