Maharashtra Board Class 7 Math Solution Chapter 15 – Statistics
Balbharati Maharashtra Board Class 7 Math Solution Chapter 15: Statistics. Marathi or English Medium Students of Class 7 get here Statistics full Exercise Solution.
Std |
Maharashtra Class 7 |
Subject |
Math Solution |
Chapter |
Statistics |
Practice Set 54
1.) The daily rainfall for each day of a week in a certain city is given in millimetres. Find the average rainfall during the week.
9, 11, 8, 20, 10, 16, 12
ANS:
Here given that, the daily rainfall for each day of a week.
We have to find average of all given data.
We know formula,
Average = Sum of all given data / Total number of given data.
There are total 7 number of data given.
Average = 9 + 11 + 8 + 20 + 10 + 16 + 12 / 7
Average = 86/7
Average = 12.2857 mm
The average rainfall during the week is 12.2857 mm.
2.) During the annual function of a school, a Women’s Self-helf Group had set up a snacks stall. Their sales every hour were worth Rs.960, Rs. 830, Rs. 945, Rs. 800, Rs.847, and Rs.970 respectively. What was the average of the hourly sales?
ANS:
Here given that,
Women’s self-helf Group had set up a snacks stall their sales per hour in rupees is given.
We have to find average ofthe hourly sales of Women’s Self-helf Group.
We know formula,
Average = Sum of all given data / Total number of given data.
There are total 6 number of data given.
Average = 960 + 830 + 945 + 800 + 847 + 970 / 6
Average =5,352/6
Average = Rs.892
Average of the hourly sales of Women’s Self-helf Group is Rs.892.
3.) The annual rainfall in Vidarbha in five years is given below. What is the average rainfall for those 5 years?
900 mm, 650 mm, 450 mm, 733 mm, 400 mm
ANS:
Here given that,
The annual rainfall in Vidarbha in five years.
We have to find average rainfall for those 5 years.
We know formula,
Average = Sum of all given data / Total number of given data.
There are total 5 number of data given.
Average = 900 + 650 + 450 + 733 + 400 / 5
Average = 3133/5
Average = 626.6 mm
Average rainfall for 5 years is 626.6 mm.
4.) A farmer bought some sacks of animal feed. The weights of the sacks are given below in kilograms. What is the average weight of the sacks?
49.8, 49.7, 49.5, 49.3, 50, 48.9, 49.2, 48.8
ANS:
Here given that,
The weights of the sacks which farmer bought.
We have to find the average weight of the sacks.
We know formula,
Average = Sum of all given data / Total number of given data.
There are total 8 number of data given.
Average =49.8 + 49.7 + 49.5 + 49.3 + 50 + 48.9 + 49.2 + 48.8 / 8
Average = 395.2/8
Average = 49.4 kg.
The average weight of the sacksof animal feed is 49.4 kg.
Practice Set 55
1.) The height of 30 children in a class is given in centimetres. Draw up a frequency table of this data.
131, 135, 140, 138, 132, 133, 135, 133, 134, 135, 132, 133, 140, 139, 132, 131, 134, 133, 140, 140, 139, 136, 137, 136, 139, 137, 133, 134, 131, 140
ANS:
Here given that,
The height of 30 children in a class in centimetres.
We have to draw frequency table of given data.
2.) In a certain colony, there are 50 families. The number of people in every family is given below. Draw up the frequency table.
5, 4, 5, 4, 5, 3, 3, 3, 4, 3, 4, 2, 3, 4, 2, 2, 2, 2, 4, 5, 1, 3, 2, 4, 5, 3, 3, 2, 4, 4, 2, 3, 4, 3, 4, 2, 3, 4, 5, 3, 2, 3, 2, 3, 4, 5, 3, 2, 3, 2
ANS:
Here given that,
There are total 50 families. The number of people in every family is given.
We have to draw frequency table of given data.
3.) A dice was cast 40 times and each score noted is given below. Draw up a frequency table for this data.
3, 2, 5, 6, 4, 2, 3, 1, 6, 6, 2, 3, 5, 3, 5, 3, 4, 2, 4, 5, 4, 2, 6, 3, 3, 2 ,4, 3, 3, 4, 1, 4, 3, 3, 2, 2, 5, 3, 3, 4
ANS:
Here given that,
A dice was cast 40 times and each score noted is given.
We have to draw frequency table of given data.
4.) The number of chapatis that 30 children in a hostel need at every meal is given below. Make a frequency table for these scores.
3, 2, 2, 3, 4, 5, 4, 3, 4, 5, 2, 3, 4, 3, 2, 5, 4, 4, 4, 3, 3, 2, 2, 2, 3, 4, 3, 2, 3, 2
ANS:
Here given that,
The number of chapatis that 30 children in a hostel need at every meal.
We have to draw frequency table for these scores