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Exercise 3.1
Question 1
Find the range of heights of any ten students of your class.
Sol :
Let the heights (in cm) of 10 students of our class be 125 , 127 , 132 , 133 , 134 , 136 , 138 , 141 , 144 , 146
Highest value among these observations = 146
Lowest value among these observations =125
Range = Highest value — Lowest value
= ( 146 – 125 ) cm
= 21 cm
Question 2
Organize the following marks in a class assessment, in a tabular form.
4 , 6 , 7 , 5 , 3 , 5 , 4 , 5 , 2 , 6 , 2 , 5 , 1 ,9 , 6 , 5 , 8 , 4 , 6 , 7
Sol :
Marks | Tally marks | Frequency |
1 | | | |
2 | || | |
3 | | | |
4 | ||| | |
5 | ||
6 | ||
7 | ||
8 | ||
9 |
(i) Which number is the highest?
Sol :
(ii) Which number is the lowest?
Sol :
(iii) What is the range of the data?
Sol :
(iv) Find the arithmetic mean.
Sol :