Q 1 – The class mark of class 90-130 is:
(a) 90
(b) 105
(c) 115
(d) 110
Ans. (d) 110
Q 2 – In order to draw a frequency polygon by using a histogram, which of the following statements is incorrect?
(a) Obtain the mid-points of three class- intervals of highest frequency on the Y-axis, one adjacent to the first on its right and one adjacent to the last, on its left.
(b) Obtain the frequency distribution and draw a histogram representing it.
(c) Join these mid-points of the adjacent rectangles of the histogram by the dotted line
(d) Obtain the midpoints of the upper horizontal side of each rectangle.
Ans. (a) Obtain the mid-points of three class- intervals of highest frequency on the Y-axis, one adjacent to the first on its right and one adjacent to the last, on its left.
Q 3 – The range of the data:
25, 81, 20, 22, 16, 6, 17,15,12, 30, 32, 10, 91, 8, 11, 20 is
(a) 10
(b) 75
(c) 85
(d) 26
Ans. (c) 85
Q 4 – Class size for the following distribution: 0 – 0.25, 0.25 – 0.50, 0.50 – 0.75 is
(a) 10
(b) 0. 25
(c) 50
(d) 2.5
Ans. (b) 0. 25
Q 5 – In a frequency distribution, the mid-value of a class is 10 and the width of the class is 6. The upper limit of the class is:
(a) 6
(b) 7
(c) 10
(d) 13
Ans. (d) 13
Q 6 – Given the class intervals 1-10, 11-20, 21-30, ___, then 20 is considered in class
(a) 11-30
(b) 11-20
(c) 21-30
(d) 15-25
Ans. (b) 11-20
Q 7 – The width of each of five continuous classes in a frequency distribution is 5 and the lower class limit of the lowest class is 10. The lower class limit of the highest class is:
(a) 15
(b) 30
(c) 35
(d) 40
Ans. (b) 30
Q 8 – The mode of the given data: 4, 6, 5, 9, 3, 2, 7, 7, 6, 5, 4, 9, 10, 10, 3, 4, 7, 6, 9, 9 is;
(a) 7
(b) 9
(c) 10
(d) 6
Ans. (b) 9
Q 9 – Let m be the mid-point and 1 be the lower class limit of a class in a continuous frequency distribution. The upper-class limit of the class is:
(a) 2m + l
(b) 2m – l
(c) m – l
(d) m – 2l
Ans. (b) 2m – l
Q 10 – The class marks of a frequency distribution are given as follows:
15, 20, 25, …
The class corresponding to the class mark 15 is:
(a) 12.5 – 17.5
(b) 17.5 – 22.5
(c) 18.5 – 21.5
(d) 19.5 – 20.5
Ans. (a) 12.5 – 17.5
Q 11 – 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 370-390 is:
(a) 0
(b) 1
(c) 3
(d) 5
Ans. (a) 0
Q 12 – 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
Ans. (b) 10
Q 13 – To draw a histogram to represent the following frequency distribution:
| Class Interval | 5-10 | 10-15 | 15-25 | 25-45 | 45-75 |
| Frequency | 6 | 12 | 10 | 8 | 15 |
the adjusted frequency for the class 25-45 is:
(a) 6
(b) 5
(c) 3
(d) 2
Ans. (d) 2
Q 14 – Which of the following variables are discrete? 1. Size of shoes, 2. A number of pages in a book, 3. Distance traveled by train, 4.
Time
(a) 1 and 2
(b) 1 and 4
(c) 1 and 3
(d) 2 and 4
Ans. (a) 1 and 2
Q 15 – The mean of 25 observations is 26. Out of these observations if the mean of the first 13 observations is 22 and that of the last 13 observations is 30, the 13th observation is:
(a) 23
(b) 26
(c) 28
(d) 30
Ans. (b) 26
Q 16 – Mode of a set of observations is the value which
(a) is the sum of the observations
(b) occurs most frequently
(c) is the mean of the middle two observations
(d) divides the observations into two equal parts
Ans. (b) occurs most frequently
Q 17 – For drawing a frequency polygon of a continuous 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 preceding classes
Ans. (c) class marks of the classes
Q 18 – The mean of five observations is 15. If the mean of the first three observations is 14 and that of the last three is 17, then the third
observation is
(a) 29
(b) 31
(c) 32
(d) 18
Ans. (d) 18
Q 19 –The median of the data: 155 160 145 149 150 147 152 144 148 is
a. 149
b. 150
c. 147
d. 144
Ans. a. 149
Q 20 – The collection of information, collected for a purpose is called:
(a) Mean
(b) Median
(c) Mode
(d) Data
Ans. (d) Data
Q 21 – The mean of x+2, x+3, x+4 and x-2 is:
Q 22 – Which of the following is not a measure of central tendency?
(a) Standard deviation
(b) Mean
(c) Median
(d) Mode
Ans. (a) Standard deviation