Tales by Dots and Lines Class 8 Very Short Question Answer

Tales by Dots and Lines Class 8 Very Short Question Answer

Tales by Dots and Lines Class 8 Very Short Question Answer

Question 1.

Find the median of the data 38, 42, 35, 37, 45, 50, 32, 43, 43, 40, 36, 43, 38, 38, 47.

Solution:

Data arranged in ascending order :

32, 35, 36, 37, 38, 38, 38, 40, 42, 43, 43, 43, 45, 47, 50 [latex]\left(\frac{15+1}{2}\right)[/latex] i. e., 8th observation is 40.

So, median is 40.

Question 2.

Find the mean of the data 4,6, 7,5, 3, 5, 4, 5, 2, 6, 2, 5, 1, 9, 6, 5.

Solution:

= [latex]\frac{75}{16}[/latex] = 4[latex]\frac{11}{16}[/latex]

Question 3.

Find the median of the data 6, 7,4, 5, 5, 3, 4, 5, 2, 6, 5, 2, 1, 9, 6, 8, 5, 6, 4, 7.

Solution:

Data arranged in increasing order is :

1, 2, 2, 3, 4, 4, 4, 5, 5, 5, 5, 5, 6, 6, 6, 6, 7, 7, 8, 9 .

Median = [latex]\frac{20 \text { th }}{2}[/latex], i.e., [latex]\frac{10 \text { th term }+11 \text { th term }}{2}[/latex]

= [latex]\frac{5+5}{2}[/latex] = 5.

Question 4.

Find the median of the first 9 even numbers.

Solution:

Number arranged in ascending order are 2, 4, 6, 8, 10, 12, 14, 16, 18.

Median = [latex]\left(\frac{9+1}{2}\right)[/latex]th, i.e., 5th even number = 10.