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1
In a city, the weekly observations on the cost of living index made in a study are given in the following table :
What is the class mark of first interval?
153
164
168
163
2
The difference between the maximum and minimum observation in the data is _________________
Class Interval
Class Mark
Range
Frequency
3
The arithmetic mean of first ten natural numbers is _______________
5.5
6
7.5
10
4
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 10 years are:
53
35
23
32
5
Which of following statements are true for secondary data
1. Data is not originally collected rather obtained from published or unpublished sources.
2. Secondary data are collected by an individual or an institution for some purpose and are used by someone else in another context.
3. The secondary data should be used with great care.
Only 1 and 2
Only 2 and 3
Only 1 and 3
1, 2 and 3
Find the mean of grouped data can be calculated using __________________ .
Mean Using Class Mark.
Assumed Mean Method
Step Deviation Method
All of these
7
The average weight of sample of 10 apples is 52 g. Later it was found that the weighing machine had shown the correct average apple 10g less. The correct average weight of an apple is
62 g
54 g
56 g
52 g
8
From the frequency table, the percentage of families with less than 3 children is Find the value of x:
15
11
18
9
There are various measures of central tendency are
1. Mean
2. Median
3. Mode
Only 1
The mean of the given data 16, 18, 19, 21, 23, 23, 27, 29, 29, 35 is _________________.
24
26
30
22
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?
12
Which of the folloiwng is true among the following about empirical formula ?
It is difference between the mean and the mode
It is three times the difference between the mean and the median
It is the relation between mode, mean and range of data
It is the difference between the mean and the mode is three times the difference between the mean and the median
13
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 7 years are:
14
Calculate the range of the given sets of data
7,47,8,42,47,95,42,96,2
84
71
94
16
30 children were asked about the number of hours, they watched TV programs in previous week. The results are as follows: 1, 6, 2, 3, 5, 12, 5, 8, 4, 8 10, 3, 4, 12, 2, 8, 15, 1, 17, 6, 3, 2, 8, 5, 9, 6, 8, 7, 14, 12 . How many children watch TV between 10-15 hours?
17
A tabular arrangement for classifying data into different groups is called____________________ .
Standard deviation
Class
Arithmetic mean
Frequency distribution
The mean of 6, y, 7, x and 14 is 8. Then
x + y = 13
x - y = 13
2x + 3y = 13
19
20
30 children were asked about the number of hours, they watched TV programs in previous week. The results are as follows: 1, 6, 2, 3, 5, 12, 5, 8, 4, 8 10, 3, 4, 12, 2, 8, 15, 1, 17, 6, 3, 2, 8, 5, 9, 6, 8, 7, 14, 12. How many children watch TV more than 5 hours?