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1
A random survey of numbers of children of various age group playing in a park was found as follows. What is the minimum class size?
2
3
4
Find the class mark with maximum frequency by using the given data:
100
90
120
110
The mode of the data : 15, 22, 17, 19, 22, 17, 29, 24, 17, 15 is _______________.
17
22
15
19
The mean of the given data 16, 18, 19, 21, 23, 23, 27, 29, 29, 35 is _________________.
24
26
30
5
The mode of a set of observations is the value which :
Occurs most frequently
Is central
Is between maximum and minimum
None of the foregoing
6
Illustration: The marks obtained by 30 students of Class X of a certain school in a Mathematics paper consisting of 100 marks are presented in table below. Find the mean of the marks obtained by the students.
61
59
59.3
None of these
7
A random survey of numbers of children of various age group playing in a park was found as follows. What is the maximum class size?
8
9
A random survey of numbers of children of various age group playing in a park was found as follows. Children playing between the age group of 5-7 years are:
18
12
14
A random survey of numbers of children of various age group playing in a park was found as follows. Children playing under the age of 17 years are:
55
48
49
44
10
The inclusive form of class boundary is defined as ________________________________________.
The class interval is defined as lower limit inclusive and the upper limit exclusive.
The true limit of a class is obtained by subtracting 0.5 from the lower limit of the class and the true upper limit of the class is obtained by adding 0.5 to the upper limit.
It is equal to half of the sum of the lower and upper limits of a class
11
Which of the following statement is true regarding range of data:
1. It tells us how widely the numbers are spread.
2. It is the difference of the highest and the lowest observation.
3. It is the average number of observations.
Only 1 and 2
Only 2 and 3
Only 1 and 3
1, 2 and 3
13
If the mean of the following distribution is 20. The value of x is _____________.
20
Which of following statements are true for secondary data
1. When an investigator collects data by using a proper form and with a definite plan.
2. Data are reliable and relevant because they are original in character.
3. Data are collected by some individuals or by some institutions or by research bodies.
The inclusive form of class boundary the value 19.6 will lie in ___________________class interval.
10 - 20
20 - 30
30 - 40
16
The total of frequency up to an upper class limit or boundary is known as _____________________.
Average frequency
Cumulative frequency
Frequency distribution
Frequency polygon
Which one of the following is not correct:
1. Statistics is liable to be misused.
2. The data collected by the investigator is known as raw data.
3. Statistical results are accurate.
4. Statistical data takes individual data into account.
Only 1
Only 2 and 4
Only 3 and 4
Which of the following statement is not true regarding range of data:
3. To calculate it we find the maximum and the minimum value in the data, and then the difference between the two is calculated.
The arithmetic mean for the following frequency distribution is_________________.
CLASS INTERVAL
FREQUENCY1
14.5
28.3
Calculate the range of the given sets of data
7,47,8,42,47,95,42,96,2
84
71
94