Answer:
x = 15
Explanation:
the mean of 4 numbers in a data set is 7. If 3 of these numbers are 2, 4, and 10, then which of the following is the fourth
number?
- we can solve with an equation, the fourth number is x
(2 + 4 + 7 + x) : 4 = 7
(13 + x) : 4 = 7
13 + x = 7 * 4
13 + x = 28
x = 28 - 13
x = 15
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check
(2 + 4 + 7 + 15) : 4 = 7
28 : 4 = 7
7 = 7
the answer is good