Median of the following numbers :
4, 4, 5, 7, 6, 7, 7, 12, 3 is
(A) 4 (B) 5 (C) 6 (D) 7
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 :
(A) upper limits of the classes (B) lower limits of the classes
(C) class marks of the classes (D) upper limits of perceeding classes
The median of the data
78, 56, 22, 34, 45, 54, 39, 68, 54, 84 is
(A) 45 (B) 49.5 (C) 54 (D) 56
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 :
(A) 23 (B) 36 (C) 38 (D) 40
There are 50 numbers. Each number is subtracted from 53 and the mean of the
numbers so obtained is found to be –3.5. The mean of the given numbers is :
(A) 46.5 (B) 49.5 (C) 53.5 (D) 56.5
The mean of 100 observations is 50. If one of the observations which was 50 is
replaced by 150, the resulting mean will be :
(A) 50.5 (B) 51 (C) 51.5 (D) 52
If each observation of the data is increased by 5, then their mean
(A) remains the same (B) becomes 5 times the original mean
(C) is decreased by 5 (D) is increased by 5
The mean of five numbers is 30. If one number is excluded, their mean becomes
28. The excluded number is :
(A) 28 (B) 30 (C) 35 (D) 38
A grouped frequency distribution table with classes of equal sizes using 63-72(72 included) as one of the class is constructed for the following data :
30, 32, 45, 54, 74, 78, 108, 112, 66, 76, 88,
40, 14, 20, 15, 35, 44, 66, 75, 84, 95, 96,
102, 110, 88, 74, 112, 14, 34, 44.
The number of classes in the distribution will be :
(A) 9 (B) 10 (C) 11 (D) 12
A grouped frequency table with class intervals of equal sizes using 250-270 (270 not included in this interval) as one of the class interval is constructed for the following data :
268, 220, 368, 258, 242, 310, 272, 342,
310, 290, 300, 320, 319, 304, 402, 318,
406, 292, 354, 278, 210, 240, 330, 316,
406, 215, 258, 236.
The frequency of the class 310-330 is:
(A) 4 (B) 5 (C) 6 (D) 7
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