Look at the histogram given below and answer the question that follow:

(i) What information is being given by the histogram?
(ii) How many teachers are of age less than 45 years?
(iii) How many teachers are of age 40 years or more but less than 55 years?

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Solution

(i) The given histogram tells about the number of teachers in a school from the age group 25-30 to 55-60.
(ii) Number of teachers with age less than 45 years = $3 + 5 + 7 + 6 = 21$
(iii) Number of teachers with age more than 40 years but less than 55 years = $6 + 4 + 3 = 13$

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The table given below shows the ages of 75 teachers in a school.

$\begin{matrix} Age (in years) & 18 - 29 & 30 - 39 & 40 - 49 & 50 - 59 Number of teachers & 3 & 27 & 37 & 8 \end{matrix}$

A teacher from this school is chosen at random. What is the probability that the selected teacher is

(i) 40 or more than 40 years old?

(ii) of an age lying between 30-39 years (including both)?

(iii) 18 years or more and 49 years or less?

(iv) 18 years or more old?

(v) above 60 years of age?

NOTE Here 18-29 means 18 or more but less than or equal to 29.

Question 90(i)

Look at the histogram below and answer the questions that follow. ?

How many students have height more than or equal to 135 cm, but less than 150 cm ?

Q. The table given below shows the ages of 75 teachers in a school.

Age (in years)	18−29	30−39	40−49	50−59
No. of teachers	5	25	35	10

Here 18−29 means from 18 to 29, including both.
A teacher from the school is chosen at random. What is the probability that the teacher chosen is
(i) 40 or more than 40 years old?
(ii) 49 or less than 49 years old?
(iii) 60 or more than 60 years old?

Q. Look at the histogram given below and answer the question that follow:

(i) How many students have height more than or equal to 135 cm but less than 150 cm?
(ii) Which class interval has the least number of students?
(iii) What is the class size?
(iv) How many students have height less than 140 cm?

Following are the ages (in years) of 360 patients, getting medical treatment in a hospital:

Age (in years)	10 – 20	20 – 30	30 – 40	40 – 50	50 – 60	60 – 70
Number of patients	90	50	60	80	50	30

One of the patients is selected at random.
What is the probability that his age is
(i) 30 years or more but less than 40 years?
(ii) 50 years or more but less than 70 years?
(iii) 10 years or more but less than 40 years?
(iv) 10 years or more?
(v) less than 10 years?

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Look at the histogram given below and answer the question that follow: (i) What information is being given by the histogram? (ii) How many teachers are of age less than 45 years? (iii) How many teachers are of age 40 years or more but less than 55 years?

(i) The given histogram tells about the number of teachers in a school from the age group 25-30 to 55-60. (ii) Number of teachers with age less than 45 years = 3+5+7+6=21 (iii) Number of teachers with age more than 40 years but less than 55 years = 6+4+3=13

Look at the histogram given below and answer the question that follow:

(i) What information is being given by the histogram?
(ii) How many teachers are of age less than 45 years?
(iii) How many teachers are of age 40 years or more but less than 55 years?

(i) The given histogram tells about the number of teachers in a school from the age group 25-30 to 55-60.
(ii) Number of teachers with age less than 45 years = $3 + 5 + 7 + 6 = 21$
(iii) Number of teachers with age more than 40 years but less than 55 years = $6 + 4 + 3 = 13$