Question

10. The average of 7.5, 3.2, 11.3, 20.5 and is 10 Find the value of x.
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Answer 1

Answer:

x=14.5

Step-by-step explanation:

There are 4 numbers already given. Remember, to find the average you have to add the value of all the numbers and divide it by the count of numbers. If there are 5 numbers(including x), and we have our average of 10, then we should start doing this problem in reverse order.

10x5+50

the 4 given numbers plus x = 50

now we subtract the value of the 4 numbers from 50

50-(.5+ 3.2 +11.3 +20.5)

50-(.5+ 3.2 +11.3 +20.5)=14.5

x=14.5