The average of 3 numbers is 78.A fourth number was added, The new average was 63. What is the new value of the fourth number.
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Answer: substitute the values to find your answer
Step-by-step explanation: The equation below is one of the more commonly understood definitions of the average:
Average =
Sum
Count
where the sum is the result of adding all of the given numbers, and the count is the number of values being added. For example, given the 5 numbers, 2, 7, 19, 24, and 25, the average can be calculated as such:
Average =
2 + 7 + 19 + 24 + 25
5
=
77
5
= 15.4
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