Ungrouped Data
Trending Questions
Q. Look at the following table below.
Class intervalClass mark0−5−−5−10−−10−1515−20
Fill in the blanks with the class marks of the corresponding class intervals.
Class intervalClass mark0−5−−5−10−−10−1515−20
Fill in the blanks with the class marks of the corresponding class intervals.
- 0, 5
- 2.5, 7.5
- 3, 8
- 5, 10
Q. If the mean and median of a moderately skewed data are 41 and 42 respectively, then its mode will be
- 42
- 41.5
- 44
- 41
Q. The arithmetic mean of n observations is ¯x. If the sum of (n – m) observations is A, then the mean of remaining m observations is
- n¯x+An−m
- n¯x−Am
- n¯x−An−m
- n¯x+Am
Q. (i) Using step-deviation method, calculate the mean marks of the following distribution.
(ii) State the model class.
(ii) State the model class.
Class interval | 50 – 55 | 55 – 60 | 60 – 65 | 65 – 70 | 70 – 75 | 75 – 80 | 80 – 85 | 85 – 90 |
Frequency | 5 | 20 | 10 | 10 | 9 | 6 | 12 | 8 |
Q. Match the datasets to their corresponding ranges.
- 7
- 8
- 11
Q. Mean of x1 and x2 is 4 and that of x1, x2, x3 and x4 is 16, the mean of 2x1, 2x2–a, x3, 2a, x4–a is
- 14
- 7.2
- 14.4
- 7
Q. The ages of three friends are a, b and c years such that a < c < b. If median age is 24 years, and ratio of their ages is 4 : 5 : 3, then the average of their ages is
- 12 years
- 20 years
- 32 years
- 28 years
Q. The mean of 53 observations is 35 and out of them three observations are 80, 30 and 60. If we exclude these three observations, then the mean is equal to
- 40
- 33.7
- 37
- 36
Q. If the mean a, b, c, d and e is 28, mean of a, c and e is 24 and mean of b and d is n2−2, then the value of n is ±k, where k is
- 6
- 7
- 4
- 8
Q. The weight (in kg) of 5 students are given. Arrange them in descending order. { 25, 35, 40, 27, 37}
- 25
- 35
- 40
- 27
- 37
Q. The average of 11 numbers is 32. If the average of the first six numbers is 34 and that of the last six is 33, then the sixth number is
- 34
- 25
- 50
- 36
Q.
The following are the marks obtained in Maths by students of Class 8:
51, 94, 34, 20, 50, 81, 81, 90, 76, 34, 51, 86, 93, 99, 26, 54, 85, 71, 88, 40, 44, 56, 55, 57, 78, 53, 81, 78, 65, 78.
The data have to be grouped to find the mean marks. One of the class intervals made is 60-70.
What is the frequency of the last class interval?
- 2
- 8
- 5
- 4
Q.
If the mean of is , find .
Q. Statistics deals with collection, organization, analysis, and interpretation of data.
- False
- True
Q.
The electricity bills of 25 houses in a village in punjab for a period of 2 moths are given below
, 8, 10, 12, 14, 15 , 16, 18, 20, 22, 24, 24 , 25, 27, 30 , 30, 36, 42 , 22, 45, 47, 50, 56.
find the range