Statisticshard · Past Paper
In a distribution of 100 observations, the sum of observations is 500. If the sum of squares of observations is 3000, the mean is:
A5
B30
C50
D3
✓ Correct Answer: A — 5
Mean = Sum / N = 500 / 100 = 5. (Sum of squares is extra information).
Share this question
More from Statistics
- If the mean of 5 observations is 10 and each observation is decreased by 3, the new sum is:
- In a deck of 52 cards, what is the probability of drawing a red face card?
- A box contains 2 defective bulbs and 8 good ones. Two bulbs are drawn without replacement. Find the probability that both are defective.
- What is the probability of getting at most 2 heads when 3 coins are tossed?
- Which value occurs most often in a dataset?