Two friends are training to run a 100 m race. Their running times over the past week. Class 7
mediumTwo friends are training to run a 100 m race. Their running times over the past week. Class 7
Question 1.
Two friends are training to run a 100 m race. Their running times over the past week are given in seconds — Nikhil: 17, 18, 17, 16, 19, 17, 18; Sunil: 20, 18, 18, 17, 16, 16, 17. Who on average ran quicker? Class 7
Solution:
Nikhil’s average
= [latex]\frac {17+18+17+16+19+17+18}{7}[/latex] = [latex]\frac {122}{7}[/latex]
= 17[latex]\frac {3}{7}[/latex] seconds
Sunil’s average
= [latex]\frac {20+18+18+17+16+16+17}{7}[/latex] = [latex]\frac {122}{7}[/latex]
= 17[latex]\frac {3}{7}[/latex] seconds
Both ran at the same pace.
Question 2.
The enrolment in a school during six consecutive years was as follows : 1555, 1670,1750, 2013, 2040, 2126. Find the mean enrolment in the school during this period. Class 7
Solution:
[latex]\frac {1555+1670+1750+2013+2040+2126}{6}[/latex]
= [latex]\frac {11154}{6}[/latex] = 1859