Statisticsmedium · Past Paper
The mean of the first $n$ natural numbers is:
A$n/2$
B$(n+1)/2$
C$n(n+1)/2$
D$n^2$
✓ Correct Answer: B — $(n+1)/2$
Sum of first n natural numbers is $n(n+1)/2$. Divide by $n$ to get the mean $(n+1)/2$.
Share this question
More from Statistics
- If the mean of n numbers is x-bar, and each number is increased by 1, 2, 3, ... n respectively, what is the new mean?
- In a frequency distribution, if the mean is 21 and the mode is 21, then the distribution is:
- Find P(A union B) given the following data.
- A box contains 5 red, 8 white and 4 green marbles. What is the probability that a marble drawn is not white?
- If for a distribution, mean = 25 and mode = 25, then the median is: