Statisticseasy · Past Paper
If the mean of 10, 12, 18, 20, p is 15, find p.
A10
B15
C20
D25
✓ Correct Answer: B — 15
Sum = 15 * 5 = 75. 10 + 12 + 18 + 20 + p = 75 => 60 + p = 75 => p = 15.
Share this question
More from Statistics
- A jar contains 2 red and 3 blue marbles. What is the probability of picking a blue marble?
- If P(A) = 0.6 and P(B) = 0.2 and A and B are mutually exclusive, what is P(A or B)?
- If two coins are tossed, what is the probability of getting at least one head?
- For a continuous distribution, the median is 30. The median class is 20-40, frequency of median class is 10, and cumulative frequency before it is 15. Find total frequency N.
- If the sum of 10 observations is 150 and the mean of 5 of them is 10, what is the mean of the remaining 5?