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Download Worksheet1.

Fill in the blanks: The mean of prime numbers between 10 and 20 is _________.

1. 11
2. 13
3. 15
4. 17

2.

The arithmetic mean of 50 values is 70. Find the new mean, if each of the 50 values is decreased by 5.

1. 70
2. 65
3. 75
4. 60

3.

Choose the correct option: The mean marks of 35 students of a class are 40. So the sum of their marks is equal to _________.

1. 1500
2. 1200
3. 1300
4. 1400

4.

The mean of five numbers is 50. If one number is excluded the mean becomes 60. Find the excluded number.

1. 10
2. 20
3. 30
4. 55

5.

For drawing a frequency polygon of a continous frequency distribution, we plot the points whose ordinates are the frequencies of the respective classes and abcissae are respectively.

1. upper limits of the classes
2. lower limits of the classes
3. class marks of the classes
4. None of these

6.

What is the median of the data 78, 56, 22, 34, 45, 54, 39, 68, 54, 84?

7.

In a mathematics test given to 15 students, the following marks (out of 100) are recorded: 41, 39, 48, 52, 46, 62, 54, 40, 96, 52, 98, 40, 42, 52, 60 . Find the median of the data.

1. 48
2. 40
3. 60
4. 52

8.

Choose the correct option: In a frequency distribution, the mid value of a class is 12 and the width of the class is 10. The lower limit of the class is ________.

1. 7
2. 17
3. 10
4. 12

9.

Choose the correct option: The class marks of a frequency distribution are given as follows : 50, 60, 70, ... The class corresponding to the class mark 60 is _______.

1. 65-75
2. 55-65
3. 75-85
4. None of these

10.

6 students devote time in hours per day are 6,8,9,12,10. Find the mean time devoted by them in a day.

1. 8 hours
2. 7 hours
3. 9 hours
4. 10 hours

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