Statisticseasy · Past Paper
What is the mid-value (class mark) of the class interval 20 - 30?
A20
B30
C25
D10
✓ Correct Answer: C — 25
Class mark = (Upper limit + Lower limit) / 2. So, (20 + 30) / 2 = 25.
Share this question
More from Statistics
- A bag contains 6 white and 4 black balls. If two balls are drawn with replacement, what is the probability that they are of different colors?
- A student has 60% chance of passing Math and 70% chance of passing English. What is the probability the student fails both?
- Find the median of 10, 10, 10, 10, 10.
- What is the probability of selecting a month that starts with 'J'?
- What is the median of 100, 200, 300?