CBSE Questions for Class 9 Maths Statistics Quiz 4 - MCQExams.com

The mean of $$a, b, c, d$$ and $$e$$ is $$28$$. If the mean of $$a, c$$ and $$e$$ is $$24$$, what is the mean of $$b$$ and $$d$$?
  • $$31$$
  • $$32$$
  • $$33$$
  • $$34$$
For which state the average number of candidates selected over the years is the maximum?
  • Delhi
  • H.P
  • U.P
  • Punjab
The librarian at the public library counted the number of books on each shelf. The highest number of books contained by any of the self is:

463516.PNG
  • $$0$$
  • $$2$$
  • $$6$$
  • $$8$$
What is the average amount of interest per year which the company had to pay during this period?
  • $$Rs. 32.43$$ lakhs
  • $$Rs. 33.72$$ lakhs
  • $$Rs. 34.18$$ lakhs
  • $$Rs. 36.66$$ lakhs
Mean of marks obtained by $$10$$ students is $$30$$.
Marks obtained are $$25,30,21,55,47,10,15,x,45,35$$.
Find the value of $$x$$.
  • $$25$$
  • $$37$$
  • $$69$$
  • $$17$$
Find AM of divisors of $$100$$.
  • $$24$$
  • $$25.5$$
  • $$24.11$$
  • $$21.9$$
If the Arithmetic mean of $$8, 6, 4, x, 3, 6, 0$$ is $$4$$; then the value of $$x =$$
  • $$7$$
  • $$6$$
  • $$1$$
  • $$4$$
The relative frequency of students working $$9$$ hours or less is
  • $$2$$
  • $$40$$
  • $$45$$
  • Can not be determined from the information given.
The histogram shows the birth weights of 100 new born babies.
How many babies weighed 8 lb or more?
585999.png
  • $$23$$
  • $$45$$
  • $$30$$
  • $$22$$
Find the number of students working $$19$$ hours or less.
  • $$40$$
  • $$50$$
  • $$90$$
  • Can not be determined without the original data
The mean age of $$25$$ students in a class is $$12$$. If the teacher's age is included, the mean age increases by $$1$$. Then teacher's age (in years) is:
  • $$24$$
  • $$38$$
  • $$30$$
  • $$48$$
The mean salary paid per week to $$1000$$ employees of an establishment was found to be Rs. $$900$$. Later on, it was discovered that the salaries of two employees were wrongly recorded as Rs. $$750$$ and Rs. $$365$$ instead of Rs. $$570$$ and Rs. $$635$$. Find the corrected mean salary.
  • $$900.90$$
  • $$1,115$$
  • $$1,225$$
  • $$900.09$$
Find the arithmetic mean of numbers from $$1$$ to $$9$$.
  • $$9$$
  • $$5$$
  • $$8$$
  • $$3$$
The mean of $$\displaystyle\frac{1}{3},\frac{3}{4},\frac{5}{6},\frac{1}{2}$$ and $$\displaystyle\frac{7}{12}$$ is ____________.
  • $$\displaystyle\frac{2}{5}$$
  • $$\displaystyle\frac{3}{5}$$
  • $$\displaystyle\frac{1}{5}$$
  • None of these
Mean of $$9$$ observations was founded to be $$35$$. Later on, it was detected that an observation $$81$$ was misread as $$18$$, then the correct mean of the observations is ____________.
  • $$40$$
  • $$41$$
  • $$42$$
  • $$43$$
Primary data in statistics is the data collected from : 
  • Primary sources
  • Secondary sources
  • Both
  • None of the above
The mean weight of 9 students is 25 kg. If one more student is joined in the group the mean is unaltered, then the weight of the 10th student is
  • 25 kg
  • 24 kg
  • 26 kg
  • 23 kg
The sum of $$15$$ observations is $$434+x.$$ If the mean of the data is $$x,$$ then find $$x.$$
  • $$25$$
  • $$27$$
  • $$31$$
  • $$33$$
In a frequency distribution with classes $$(1-8),(9-16),(17-24).... $$the class interval is 
  • 8
  • 9
  • 7
  • 3
Range of the data is always from the data.
  • True
  • False
From the given histogram, we can say that $$ 1500 $$ males above the age of $$ 20 $$ are literate.
1793524_b6f33257751647cd87013f1a0fa0e1c1.png
  • True
  • False
State whether the following statements are true (T) or false (F):
In a bar graph, width of a bar has no significance. It is only for eye attraction.
  • True
  • False
State whether the following statements are true (T) or false (F):
In a bar graph, bars can be drawn either vertically or horizontally.
  • True
  • False
Let $$m$$ be the mid-point and $$l$$ be the upper class limit of a class in a continuous frequency distribution. The lower class limit of the class is:
  • $$2m + l$$
  • $$2m - l$$
  • $$m + l$$
  • $$m + 2l$$
If the fifth class interval is $$ 60 -65, $$ fourth class interval is $$ 55-60, $$ then the first class interval is $$ 45-50 $$.
  • True
  • False
Which of the following data is not primary?
  • By visiting a certain class, gathering information about the attendance of students.
  • By an actual visit to homes, to find a number of family members.
  • To get information regarding the plantation of soyabean done by each farmer from the village Talathi.
  • Review the cleanliness status of canals by actually visiting them.
Fill in the blank:
The height of a rectangle in a histogram represent _______.
  • class interval
  • midpoint
  • frequency density
  • frequency
The class mark of the class interval 20 - 29 is
  • 20
  • 29
  • 25
  • 24.5
The mean of first ten odd natural number is
  • 5
  • 10
  • 20
  • 19
What is the upper-class limit for the class $$25-35$$?
  • $$25$$
  • $$35$$
  • $$60$$
  • $$30$$
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