Statisticsmedium · Past Paper
If the mean of 10, 15, x, 20, 25 is 18, find x.
A18
B20
C15
D22
✓ Correct Answer: B — 20
(10+15+x+20+25)/5 = 18 => 70+x = 90 => x = 20.
Share this question
More from Statistics
- If P(A) = 0.65, find the probability of the complement of A.
- If the median of 5 numbers is 10, and each number is increased by 2, the new median is:
- If the mean of 10 observations is 20 and another 10 observations is 30, the combined mean is:
- What is the probability of picking a prime number from the set {1, 2, 3, ..., 10}?
- If the total number of items in a frequency distribution is 50, what is the position of the median?