Statisticshard · Past Paper
Find the missing frequency f for the class 20-30 if the median is 25, N=60, cf=20, and class interval size is 10.
A10
B20
C30
D40
✓ Correct Answer: B — 20
Median = L + [(N/2 - cf)/f]*i => 25 = 20 + [(30 - 20)/f]*10 => 5 = 100/f => f = 20.
Share this question
More from Statistics
- In a continuous series, the median is 35 and the median class is 30-40. If f=10 and h=10, and N=50, what is the 'cf' of the pre-median class?
- If the mean of 5 observations is 10 and each observation is decreased by 3, the new sum is:
- A card is drawn from a deck. What is the probability it is a Jack of Spades?
- A card is drawn from a pack of 52. What is the probability it is a diamond or an ace?
- The middle value of 5, 2, 8, 12, 4 is: