Question 11
Question: Find the mean of the following frequency distribution:
Answer:
Mean = 25
Question 12
Question: The data on number of patients in a hospital in a month are given below. Find the average number of patients attending the hospital in a day.
Answer:
Mean = 28.67
Question 13
Question: Find the missing frequency (p) in the following distribution, whose mean is 54.
Answer:
Given Mean = 54
Cross - multiplying, we get
54(92 + p) = 5160 + 30p
4968 + 54p = 5160 + 30p
54p - 30p = 5160 - 4968
24p = 192
p = 8
Question 14
Question: A TV station broadcasts 
hours each day on an average. A programme analysis shows.
Represent the above data by (a) a bar chart (b) a pie chart.
Answer: (a) Bar chart
(b) Pie chart
Calculation of Angles.
Drama:Angle at the centre 
Documentary: Angle 
Sports: Angle 
News: Angle 
Others: Angle 
Question 15
Question: The total votes polled (to the nearest 100) in a certain by - election were distributed among the various candidates as follows:
Represent the above data by (a) a bar graph, (b) a pie graph
Answer: (a) Bar graph
(b) Pie Graph
Calculation of Angles:
A: Angle at the centre 
B: Angle at the centre 
C: Angle at the centre 
D: Angle at the centre 
E: Angle at the centre 
Question 16
Question: The daily average price of Rank Xerox's share is listed below for a week.
Represent the data by a bar graph.
Answer:
Question 17
Question: The rainfall over an island for a year is recorded below.
Present this information by a bar chart.
Answer:
Question 18
Question: The monthly expenses of two families are as follows:
Illustrate the data by 'double bar' graph
Answer:
Question 19
Question: Areas in million square km of oceans of the world are:
Draw (a) a bar graph (b) a pie chart
Answer:
(a) Bar graph
(b) Pie chart
Working:
Question 55
Question: Three coins are tossed simultaneously 250 times with the following frequencies of different out comes.
If these coins are tossed gain what is the probability of getting 2 heads?
Answer: Let E denote the event of getting 2 heads.
