Page 208 - Maths Skills - 7
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206 Maths
SUBJECTIVE TYPE QUESTIONS 5. The electricity bills (in rupees) of 12 houses
of a certain locality for a month are given
F. Solve the following word problems below:
1. The mean of 17 observations is 92. What is the 324, 700, 617, 400, 356, 570, 312, 630, 584,
sum of all the observations? 674, 754, 700
2. The mean marks of seven students are 55. The Calculate the mean, median and mode of the
marks of 6 students are 52, 54, 55, 53, 56 and 54. data.
Find the marks of the seventh student.
3. The mean of five numbers is 30. If one more 6. The weekly pocket expenses of 15 students of a
class are given below:
number is included, the mean still remains 30.
Find the included number. 62, 80, 111, 75, 84, 75, 60, 62, 100, 84, 62,
4. The marks obtained by 30 students of a class in 100,111, 84, 62
an examination are given below: (i) Calculate the range of this data.
22, 17, 13, 26, 29, 11, 22,15, 24,21, 24,23, 21, 27, (ii) What is the average weekly expenditure
29, 25,15, 18, 27, 19, 14, 21, 15, 29, 20, 12, 21, of the class?
10, 16, 20 (iii) Calculate the mode and median.
Find the arithmetic mean, mode and range of the
data.
INTEGRATED QUESTION
G. Social Science Vs Maths
The table given below shows average monthly rainfall of Mumbai and Lucknow.
Months Lucknow (inches) Mumbai (inches)
January 0.6 0.0
February 0.8 0.1
March 0.5 0.1
April 0.6 0.1
May 1.0 1.8
June 2.8 15.8
July 6.3 23.4
August 6.7 16.8
September 3.9 10.6
October 0.6 3.3
November 0.1 0.4
December 0.3 0.1
(a) Use the data to find the arithmetic mean of rainfall in Lucknow.
(b) Use the data to find the arithmetic mean of rainfall in Mumbai. A rain gauge is tool to measure the
(c) Make a double bar graph to represent the data shown above. amount of rain that has fallen over a
(d) Use the data to find the mode of rainfall in Mumbai. period of time.
(e) Use the data to find the median of rainfall in Lucknow.