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Standard VII

Mathematics

Arithmetic Mean and Range

The marks of ...

Question

The marks of $20$ students in a test were as follows:
$5, 6, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 18, 19, 20.$
The mean is

14

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13

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12

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15

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Solution

The correct option is B $13$
Marks are: $5, 6, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 18, 19, 20.$
Sum of marks $= 260$
Number of students $= 20$
Mean $= \frac{Sum}{Numbers} = \frac{260}{20} = 13$

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Question 93

The marks obtained (out of 20) by 30 students of a class in a test are as follows :
14, 16, 15, 11, 15, 14, 13, 16, 8, 10, 7, 11, 18, 15, 14,
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Q. Marks of

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. Assume a mean and calculate the arithmetic mean of the data. Assume another number as mean and calculate the arithmetic mean again. Do you get the same result? Comment

Q. The mark obtained by

15

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12, 14, 07, 09, 23, 11, 08, 13, 11, 19, 16, 24, 17, 03, 20

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The marks of 20 students in a test were as follows:5,6,8,9,10,11,11,12,13,13,14,14,15,15,15,16,16,18,19,20.The mean is

The correct option is B 13Marks are: 5,6,8,9,10,11,11,12,13,13,14,14,15,15,15,16,16,18,19,20.Sum of marks =260Number of students =20Mean =SumNumbers=26020=13

The marks of $20$ students in a test were as follows:
$5, 6, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 18, 19, 20.$
The mean is

The correct option is B $13$
Marks are: $5, 6, 8, 9, 10, 11, 11, 12, 13, 13, 14, 14, 15, 15, 15, 16, 16, 18, 19, 20.$
Sum of marks $= 260$
Number of students $= 20$
Mean $= \frac{Sum}{Numbers} = \frac{260}{20} = 13$