Statisticshard · Past Paper
If the mean of 2, 3, x, 7, 8 is x, then x is:
A5
B4
C6
D7
✓ Correct Answer: A — 5
Sum = 20+x. Mean = (20+x)/5 = x $\Rightarrow$ 20+x = 5x $\Rightarrow$ 4x = 20 $\Rightarrow$ x = 5.
Share this question
More from Statistics
- What is the median of the first 7 natural numbers?
- The median of a set of 10 observations is the average of which two terms when arranged in order?
- Which of these describes an event with probability 0.5?
- If a die is rolled, what is the probability of getting a number 8?
- What is the probability of getting a prime number when a die is thrown?