Page 207 - Maths Skills - 8

Data Handling 205

10. If three coins are tossed simultaneously, the 8. In intervals 30 – 40 and 40 – 50, 40 is recorded
probability of getting exactly three heads is: in the interval 30 – 40.

(i) 1 (ii) 3 (iii) 1 (iv) 0 9. The frequencies are generally plotted on the
6 8 8 x-axis.

B. Fill in the Blanks 10. In a histogram, the rectangles are drawn
1. The difference between the highest and the proportional to the frequencies of their classes.
lowest values of observations in a data is called
the ______________ of the data.
2. Each grouped data is called a ______________. D. Case Study Based Questions
3. The difference between the two limits of any In the summer, a survey was conducted among some
class is called the ________________. people about their favourite drinks. The following
4. The mid-value of each class interval is called its pie-chart shows the data—
________________. Tea 30%
5. For five occurrences of a particular item in a Hot Coffee 25%
given data are recorded using tally marks as Cold Drinks 15%
________________.
Coconut Water 10%
6. Sum of all the probabilities of all the events of
an experiment is ________________. Juice 20%
7. Each outcome of an experiment is called Answer the following questions on the basis of the
________________. above data.
8. The set of all possible outcomes is called the 1. If 300 people like coffee, then the number of
________________. people on which survey was conducted is:
9. P(E) = ________________. (i) 1000 (ii) 120

10. The probability of an impossible event is (iii) 1200 (iv) 1500
______________. 2. The ratio of number of people who like coffee to

C. Write ‘T’ for true and ‘F’ for false statements the total number of people is
(i) 1:4 (ii) 5:6
1. The probability of an event lies between 0 and 1,
both inclusive. (iii) 2:5 (iv) 3:20
3. The central angle in the pie chart for the people
2. The probability of a sure event is 0. who like cold drinks is

3. The possible results of the experiment are called (i) 54° (ii) 45°
events. (iii) 40° (iv) 27°
4. How many more people like tea than cold
4. When a dice is rolled, the sample space is 6. drinks?

5. P(E) = No.offavourable outcomestoE (i) 400 (ii) 300
S (iii) 180 (iv) 60
6. Mean = Sumofall observations .
Number of observations E. Assertion-Reason Based Questions
7. The number on the left of a class interval is Directions for Questions 1 to 2: In each of the
called the upper limit. questions given below, there are two statements