The table shows the lifetimes of a sample of electric light globes

MATHEMATICS · Multi-part · CBSE · Mathematics · Statistics · Statistics

Problem

The table shows the lifetimes of a sample of electric light globes.
Life ( ll hours)Number of globes
0≤l<5000 \le l < 5005
500≤l<1000500 \le l < 100017
1000≤l<20001000 \le l < 200046
2000≤l<30002000 \le l < 300079
3000≤l<40003000 \le l < 400027
4000≤l<50004000 \le l < 50004
(1) Draw a cumulative frequency graph for the data. (2) Estimate the median life of a globe. (3) Estimate the percentage of globes which had a life of 2700 hours or less. (4) Estimate the number of globes which had a life between 1500 and 2500 hours.

Related theory

Browse the problem library