- A32.4 years
- B31 years
- C31.8 years
- D30 years
Step-by-Step Solution
Class marks 10, 20, 30, 40, 50. ; mean years.
Answer: C) 31.8 years
Ages of 50 members of a yoga club in Rishikesh: 5–15 years – 4, 15–25 – 11, 25–35 – 15, 35–45 – 12, 45–55 – 8. What is the mean age?
Competition practiceStatistics
Master this topic in 30 minutes a day.
Don't just memorise the answer — build a daily practice habit.
Practice 5 Similar Questions Free →All Statistics practice questions
More Statistics practice
Heights of 60 saplings in a nursery: 100–110 cm – 7, 110–120 – 13, 120–130 – 21, 130–140…Three batches at a coaching centre had pass rates of 80% (40 students), 65% (60…A shop's monthly sales (₹ lakh) for six months were 12, 15, 18, 14, 20 and 23. What is…A car covers three equal stretches of a highway at 30 km/h, 40 km/h and 60 km/h. What is…Four numbers have a mean of 25. When a fifth number is included, the mean goes up by…