CBSE Questions for Class 9 Maths Statistics Quiz 8 - MCQExams.com

In the graph you can find the takings of a chocolate bar for $$8$$ months.
Answer the following question:
Find the percent increase from May to June.

463092_5853f6cea44549ceb8687edc93fff752.png
  • $$10\%$$
  • $$25\%$$
  • $$30\%$$
  • $$50\%$$
In the graph you can find the takings of a chocolate bar for $$8$$ months. Answer the following question
Identify in which two months $$50000$$ chocolate bars are taken out?

463094_d8a8d72084504ba39f9b4874403f2ee4.png
  • Jan and Feb
  • Jun and Jul
  • Jan and Jun
  • Feb and Mar
The histogram shows the age groups of working women in a city. Find the number of working women in the age group of $$29 - 34$$ years.

463514.PNG
  • $$300$$
  • $$230$$
  • $$320$$
  • $$410$$
Identify the frequency polygon.
In which frequency polygon is best suitable for the following table.
Month
    Jun.
     Jul.
     Aug.
     Sep.
    Oct.
Number of burgers sold
    100
     400
     300
     500
    200
Brian got grades of $$92,89$$ and $$86$$ on his first three math tests. What grade must he get on his final test to have an overall average of $$90$$?
  • 90
  • 93
  • 87
  • 85
Consider the following statements in respect of a histogram:
The histogram consists of vertical rectangular bars with a common base such that there is no gap between consecutive bars.
The height of the rectangle is determined by the frequency of the class it represents.
Which of the statement given above is/are correct?
  • $$1$$ only
  • $$2$$ only
  • Both $$1$$ and $$2$$
  • Neither $$1$$ nor $$2$$
The two types of the statistical data are ______ data and secondary data.
  • presentation data
  • Primary data 
  • personal data
  • None of the above
Which year did the same number of boys and girls attend the conference?
537598.PNG
  • 1995
  • 1996
  • 1997
  • 1998
  • None
The mean of $$48, 27, 36, 24, x$$, and $$2x$$ is $$37.x =$$
  • $$13\dfrac {1}{3}$$
  • $$16\dfrac {2}{3}$$
  • $$29$$
  • $$33\dfrac {3}{4}$$
  • $$40$$
The difference in the sales of cellular phones for the years $$1997$$ and $$1999$$ is?
548625.jpg
  • $$500$$ units
  • $$1,000$$ units
  • $$5,000$$ units
  • $$18,000$$ units
The average of six numbers isIf the average of two of those numbers is 2, what is the average of the other four numbers?
  • 5
  • 6
  • 7
  • 8
  • 9
Find the arithmetic mean of $$\dfrac {1}{2}, \dfrac {1}{3}, 2n$$ and $$m$$.
  • $$\dfrac {5 + 12n + 6m}{24}$$
  • $$\dfrac {5 + 8n + 4m}{24}$$
  • $$\dfrac {5 + 2n + m}{4}$$
  • $$\dfrac {5 + 12n + 6m}{6}$$
  • $$\dfrac {5 + 2n + m}{12}$$
On approximately, the number pf days with more than $$70^oF$$ temperature is ____.
586083.png
  • Approx. $$12$$
  • Approx. $$39$$
  • Approx. $$93$$
  • None of these
The  range of the following data is:
$$84,56,39,45,54,39,56,54,84,21,77,56$$ 
  • $$55$$
  • $$56$$
  • $$58.5$$
  • $$63$$
For a collection of $$11$$ items, sum of all items is $$132$$, then the arithmetic mean is.
  • $$11$$
  • $$12$$
  • $$14$$
  • $$13$$
Find the mean of the first five prime numbers.
  • 3.3
  • 7.8
  • 5.6
  • 12.1
Which numbers have equal frequencies?
  • $$4, 6, 8$$
  • $$1, 4, 6$$
  • $$1, 2, 3$$
  • $$4, 5, 7$$
If there are $$N$$ individual observations $$X1, X2, ....Xn$$, Arithmetic mean $$=$$?
  • $$\overline {X} = \dfrac {X_{1}\times X_{2} \times X_{3}\times ......X_{n}}{N}$$
  • $$\overline {X} = \dfrac {X_{1} + X_{2} + X_{3} +......X_{n}}{N}$$
  • $$\overline {X} \dfrac {\sum X_{i}}{N}$$
  • (B) or (C)
Secondary data in statistics is the data collected from :
  • Primary sources
  • Secondary sources
  • Both
  • None of these
The bar graph shows the number of traffic accidents in a country from year $$2000$$ to $$2014$$ . What is the difference between accidents in the year $$2001$$ and $$2004$$.
699299_030ad0d30ed542379c55ad88786380db.png
  • $$60,000$$
  • $$40,000$$
  • $$20,000$$
  • $$45,000$$
The number of students watched TV for less than $$4$$ hours , is ______ .
724422_c8865c7f3a20425c962b5c95fc7d1a55.png
  • $$4$$
  • $$8$$
  • $$34$$
  • $$22$$
The given bar graph shows the number of matches played by different teams. Read the bar graph and answer the questions:
How many matches did both India and Bangladesh play?
723036_4f852b14f48140b18a0a724355529aa3.png
  • $$34$$
  • $$22$$
  • $$38$$
  • $$40$$
The mean is_____________________.
  • the statistical or arithmetic average
  • the middlemost score
  • the most frequently occurring score
  • the best representation for every set of data
_____It is the difference between the upper limit and lower limit of the same class.
  • Class Interval
  • Class Frequency
  • Class Limit
  • Class Numbers
The arithmetic mean between $$\cfrac { x+a }{ x } $$ and $$\cfrac { x-a }{ x } $$ when $$x\ne 0$$, is (the symbol $$\ne$$ means "not equal to"):
  • $$2$$, if $$a\ne 0$$
  • $$1$$
  • $$1$$, only if $$a=0$$
  • $$\dfrac {a}{x}$$
  • $$x$$
The average of five numbers is $$40$$ and the average of another six numbers is $$50$$. The average of all numbers taken together is _______.
  • $$44.44$$
  • $$45.00$$
  • $$45.45$$
  • $$90.00$$
The average rainfall for a week, excluding Sunday, was $$10\ \text{cms}$$. Due to heavy rainfall on Sunday, the average for the week rose to $$15\ \text{cms}$$. How much rainfall was on Sunday?
  • $$25\ \text{cms}$$
  • $$35\ \text{cms}$$
  • $$45\ \text{cms}$$
  • $$55\ \text{cms}$$
The average (arithmetic mean) of a set of seven numbers is $$8$$. When an eighth number is added to the set, the average of the eight numbers is still $$8$$. What number was added to the set?
  • $$6$$
  • $$7$$
  • $$8$$
  • $$9$$
The average marks of three batches of students having 70, 50 and 30 students respectively are 50, 55 andFind the average marks of all the 150 students, taken together.
  • $$50.67$$
  • $$40.67$$
  • $$50.60$$
  • $$40.60$$
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