Statisticshard · Past Paper
The median of a continuous series is 30. The median class is 20-40, frequency of median class is 10, CF of preceding class is 5, and class width is 20. Find N.
A10
B20
C30
D40
✓ Correct Answer: B — 20
30 = 20 + [(N/2 - 5)/10] * 20 => 10 = (N/2 - 5) * 2 => 5 = N/2 - 5 => 10 = N/2 => N = 20.
Share this question
More from Statistics
- A card is drawn from 52 cards. What is the probability it is not a face card?
- Find the median of: 5, 3, 8, 10, 2, 7, 6.
- A die is thrown once. What is the probability of getting an odd number?
- A student scored 60, 70, and 80 in three tests. What score does he need in the fourth test to have a mean of 75?
- If a data set has two modes, it is called: