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1.In a frequency distribution mode is 7.88, mean is 8.32 find the median.?

7.2

8.17

8.1

cannot be determined

2) The mean of 20 numbers is 31, what will be the new mean, if each observation is increased by 4?

35

33

34

None of these

3.What measure of central tendency is represented by the abscissa of the point where less than ogive and more than ogive intersect?

mean

mode

median

None of these

4. The mean of the frequency distribution. ?

class-interval | 50-60 | 60-70 | 70-80 | 80-90 | 90-100 |

Frequency | 8 | 6 | 12 | 11 | 13 |

76

78

80

None of these

5. The modal class of the grouped size frequency table given below is

class-interval | 50-60 | 60-70 | 70-80 | 80-90 | 90-100 | 100-110 |

Frequency | 18 | 62 | 12 | 11 | 13 | 13 |

60-70

50-60

80-90

None of these

6. For ‘more than ogive’ the x-axis represents :

upper limits of class-intervals

frequency

lower limits of class intervals

mid-values of class-intervals

7.Find the value of k if the median of the following frequency distribution is 50 ?

class-interval | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 | 80-90 |

Frequency | 25 | 15 | k | 6 | 24 | 12 | 8 |

10

20

15

None of these

8.Which of these is not a measure of centeral tendency of the frequncy distribution

mean

mode

median

range

9.The mean of 25 observations is 36. Out of these observations if the mean of first 13 observations is 32 and that of the last 13 observations is 40, the 13th observation is ?

24

35

34

36

10.The class marks of the frequency distribution is 15,20,25,30......45. What is the class interval for class mark 45?

40-50

42.5-47.5

42-48

none of these