Learn Maths Statistics, Class 9 Maths Statistics Exercise, Free Online Statistics Lessons

Class 9 Maths Study Material

An Educational platform for Preparation and Practice Class 9. Kidsfront provide unique pattern of learning Maths with free online comprehensive study material in the form of QUESTION & ANSWER for each Chapter of Maths for Class 9. This study material help Class 9, Maths students in learning every aspect of Statistics. Students can understand Statistics concept easily and consolidate their learning by doing Online Practice Tests on Maths,Statistics chapter repeatedly till they excel in Class 9, Statistics. Free ONLINE PRACTICE TESTS on Class 9, Statistics comprise of Hundreds of Questions on Statistics, prepared by the highly professionals team. Every repeat test of Statistics will have new set of questions and help students to prepare themselves for exams by doing unlimited Online Test exercise on Statistics. Attempt ONLINE TEST on Class 9,Maths,Statistics in Academics section after completing this Statistics Question Answer Exercise.

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Statistics

The class mark of a class is 10 and its class width is 6. The lower limit of the class is

a)
3

b)
6

c)
7

d)
5

✔Answer

Correct Answer Is :
7

Solution Is :

The median of 20,22,24,26,28,30 is

a)         29
b)         27
c)         23
d)         25

✔Answer

Correct Answer Is : 25

Solution Is :

The mean of first five prime numbers is

a)         4.5
b)         5.6
c)         6.2
d)         6.5

✔Answer

Correct Answer Is : 5.6

Solution Is :

Let m be the mid-point and l be the upper class limit in an upper frequency distribution. The lower class limit of the class is

a)         2m-l
b)         2m+l
c)         m-l
d)         m+l

✔Answer

Correct Answer Is : 2m-l

Solution Is :

If the mean of the observations x,x+3,x+5,x+7,x+10 is 9, the mean of the last three observations is

a)         10 2/3
b)         10 1/3
c)         11 1/3
d)         11 2/3

✔Answer

Correct Answer Is : 11 1/3

Solution Is :

Mode of the data 15,16,14,19,15,20,14,17,15,12,14,15,18,17,15,14,13 is

a)         16
b)         17
c)         14
d)         15

✔Answer

Correct Answer Is : 15

Solution Is :

The mean of 6 observations is 35. If one observation is excluded, the mean becomes 32. The excluded observation is

a)         35
b)         50
c)         46
d)         62

✔Answer

Correct Answer Is : 50

Solution Is :

If each observation of the data is increased by 5, then their mean

a)         is increased by 5
b)         becomes 5 times the original mean
c)         is decreased by 5
d)        remains the same

✔Answer

Correct Answer Is : is decreased by 5

Solution Is :

The mean of 15 observations is 25. If the mean of first 8 observations is 20 and that of last 8 observations is 30, then the 9th observation is

a)         25
b)         30
c)         27.5
d)         22.5

✔Answer

Correct Answer Is : 25

Solution Is :

The mean weight of 20 students is 65 kg. On including the teacher`s weight, the mean weight becomes 65.5 kg. The weight of the teacher is

a)         85
b)         78
c)         75.5
d)         67.5

✔Answer

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Class 9 Maths Study Material

Statistics

The class mark of a class is 10 and its class width is 6. The lower limit of the class is

Correct Answer Is : 7

Solution Is :

The median of 20,22,24,26,28,30 is

Correct Answer Is : 25

Solution Is :

The mean of first five prime numbers is

Correct Answer Is : 5.6

Solution Is :

Let m be the mid-point and l be the upper class limit in an upper frequency distribution. The lower class limit of the class is

Correct Answer Is : 2m-l

Solution Is :

If the mean of the observations x,x+3,x+5,x+7,x+10 is 9, the mean of the last three observations is

Correct Answer Is : 11 1/3

Solution Is :

Mode of the data 15,16,14,19,15,20,14,17,15,12,14,15,18,17,15,14,13 is

Correct Answer Is : 15

Solution Is :

The mean of 6 observations is 35. If one observation is excluded, the mean becomes 32. The excluded observation is

Correct Answer Is : 50

Solution Is :

If each observation of the data is increased by 5, then their mean

Correct Answer Is : is decreased by 5

Solution Is :

The mean of 15 observations is 25. If the mean of first 8 observations is 20 and that of last 8 observations is 30, then the 9th observation is

Correct Answer Is : 25

Solution Is :

The mean weight of 20 students is 65 kg. On including the teacher`s weight, the mean weight becomes 65.5 kg. The weight of the teacher is

Correct Answer Is : 75.5

Solution Is :

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Correct Answer Is :
7