Statisticsmedium · Past Paper
For a distribution, if $\sum f = 20$ and $\sum fx = 100$, what is the mean?
A20
B5
C80
D0.2
✓ Correct Answer: B — 5
Mean = $\sum fx / \sum f = 100 / 20 = 5$.
Share this question
More from Statistics
- If the mean of a group of observations is 50, and later it's discovered that an observation of 60 was misread as 40, what will happen to the mean after correction?
- If the mean of $n$ numbers is $M$, and the sum of first $(n-1)$ numbers is $S$, the $n^{th}$ number is:
- Two dice are thrown. What is the probability that the difference between the numbers is 2?
- A card is drawn from a pack of 52. What is the probability that it is a face card?
- Three fair coins are tossed. What is the probability of getting exactly two tails?