Statisticsmedium · Past Paper
The arithmetic mean of 1, 2, 3, ... n is:
An/2
B(n+1)/2
Cn(n+1)/2
D(n-1)/2
✓ Correct Answer: B — (n+1)/2
Sum of first n natural numbers is n(n+1)/2. Mean = Sum / n = [n(n+1)/2] / n = (n+1)/2.
Share this question
More from Statistics
- What is the probability of drawing a black card or a king from a deck of 52 cards?
- In the word 'MATHEMATICS', what is the probability of selecting the letter 'M'?
- In a class, 40% students play football, 50% play cricket and 10% play both. What is the probability a student plays neither?
- A coin is tossed 3 times. What is the probability of getting exactly one head?
- Two dice are rolled. What is the probability of getting a sum of 10?