Statisticsmedium · Past Paper
If the mean of $x, x+3, x+6, x+9, x+12$ is 10, then x is:
A4
B1
C2
D6
✓ Correct Answer: A — 4
Mean is the middle term $x+6$ for an AP. $x+6=10 \Rightarrow x=4$.
Share this question
More from Statistics
- Find the range of -5, -2, 0, 3, 8.
- What is the formula for the position of the Upper Quartile (Q3) in a discrete series with N items?
- A coin is tossed. What is the probability of NOT getting a head?
- The mean of five numbers is 20. If one number is excluded, the mean becomes 15. What is the excluded number?
- A student scored 60, 70, and 80 in three tests. What score does he need in the fourth test to have a mean of 75?