NECO 2023 · Paper 1 · Q57

Statistics: data & averages

The mean of the numbers 2, 5, $x$ , 6 is 4. What is the value of $x$ ?

Worked solution (try it first)

Four numbers with mean 4 add up to $4 \times 4 = 16$ .
So $2 + 5 + x + 6 = 16$ , which gives $13 + x = 16$ .
So $x = 3$ , option E.

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