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lana [24]
3 years ago
14

Urgent help please

Mathematics
1 answer:
andrew-mc [135]3 years ago
6 0

Mean is the arithmatic average of a given data set. So,

Mean= \frac{Sum of the data}{Number of the data}

There are seven data in the data set.

According to the given problem,

\frac{18+p+13+q+15+r+7 }{7} =11

\frac{53+p+q+r }{7} =11 Combine the like terms of the numerator.

\frac{53+p+q+r }{7}*7 =11 *7 Multiplying 7 to each sides of equation.

53 + p + q + r = 77

53 + p + q + r - 53 = 77 - 53 Subtract 53 from each sides.

p + q + r = 24

Next step is to divide each sides by 3 so that we can write this in form of mean of p, q and r. Therefore,

\frac{p + q + r}{3} =\frac{24}{3}

So, mean of p, q and r = 8.

I hope this helps you!.

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============================================

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