Arithmetic Mean and Range

Q. The price of onion is increased by 25% . How much percent satish should reduce his consumption so that his expenditure for purchase of onion does not change
Please do it without using any formula
only use percentage

Q.

A number when decreased by 16% becomes 798, find the number

Q.

Question 11

Listed below are the temperatures in ${}^{\circ }C$ for 10 days.
-6, -8, 0, 3, 2, 0, 1, 5, 4, 4
What is the range of the data?

(a) 8°C

(b) 13°C

(c) 10°C

(d) 12°C

Q.

Average Propensity to Consume Can Never Be ………………………... (Choose the Correct Alternative)

1. Positive

2. Zero

3. More than one

4. less than one

Q. Tick (✓) the correct answer:
A does 20% less work than B. If A can finish a piece of work in $7\frac{1}{2}$ hours, then B can finish it in
(a) 5 hours
(b) $5\frac{1}{2}$ hours
(c) 6 hours
(d) $6\frac{1}{2}$ hours

Q.

If Chameli had$Rs.600$ left after spending $75\%$ of her money, how much did she have in beginning?

Q. 1) define class marks . find the class mark of the class intervel 25 - 30.

2) thwe hights(in cm ) of 20 students were recorded as given
133 130 130 135 136 126 128 143 142 135 132 126 130 135 125 134 136 142

Q.

In a class of 40 children, 40% are girls. How many more girls coming to this class would make this 50%?

Q. The difference between the highest and the lowest values of a set of data is
called________.

Q.

What are arithmetic mean and geometric mean?

Q.

The marks obtained by $10$ students in a test are $15,75,33,67,76,54,39,12,78,11$. Find the arithmetic mean.

Q.

Find the range of this data:

7, 6, 17, 25, 2, 1

1. 16

2. 24

3. 3

4. 8

Q.

The range of the data: 11, 22, 33, 44 is:

1. 33

2. 22

3. 44

4. 30

Q.

The prices (in rupee) of various books on English grammar at book store are:

$\text{34.50, 45.00, 52.50, 60.00, 50.00, 74.50}$ Find the mean price of the books.

Q.

If the mean of 8, 12, 21, 42, x is 20, find the value of x.

Q.

The number of members in the 40 families in Bhilar are as follows:1, 6, 5, 4, 3, 2, 7, 2, 3, 4, 5, 6, 4, 6, 2, 3, 2, 1, 4, 5, 6, 7, 3, 4, 5, 2, 4, 3, 2, 3, 5, 5, 4, 6, 2, 3, 5, 6, 4, 2. Prepare a frequency table and find the mean of members of 40 families.

Q.

The following data is collected in a survey of some students of 10th standard from some schools. Draw the percentage bar graph of the data.

Q.

Find the $312th$ triangular number using the average method.

Q.

Why is $30$ statistically significant?

Q.

What is the range for the following data set?

50 50 50 50 50

___

Q.

Mean is also called as ___.

1. Average

2. Mode

3. Median

4. Factor

Q.

What is the arithmetic mean in the following table on the variable score?

Student_ID	Score
$R304110$	$0.98$
$R304003$	$0.88$
$R102234$	$0.65$
$R209939$	$0.92$

1. $0.92$

2. $0.88$

3. $0.765$

4. $0.8575$

Q.

If $x,y,z$ are three positive numbers, then the minimum value of $\frac{y+z}{x}+\frac{z+x}{y}+\frac{x+y}{z}$ is

1. $1$

2. $2$

3. $3$

4. $6$

Q.

Determine the range for -68, 85, 55, 148 and 117?

1. 216

2. 238

3. 447

4. 425

Q.

Find the arithmetic mean of 2, 4, 6, 8, 10.

1. 6

2. 5

3. 4

4. 3

Q. Find the range of following set of integers:
-2 , 5 , 12, -10, 0, -9 , -13, 1, 4 , 2 , 9, -8

1. 25
2. -1
3. -19
4. 19

Q.

Four alternative options are given for each of the following statements. Select the correct option.

The mean of scores 10, 15, 12, 15, 15 is:

A. 15

B. 13

C. 13.4

D. 14.3

Q. Mark (✓) against the correct answer:
A number decreased by 30% gives 84. The number is
(a) 90
(b) 110
(c) 120
(d) 135

Q.

There are 50 students in a class and the average mark scored by the class in Maths is 65 out of 100. The total marks scored by all the students except Karan and Arjun is 3080. If the marks scored by Karan & Arjun are same. What is the mark scored by Arjun?

1. 75

2. 80

3. 85

4. 90

Q.

What is the range of 151, 213, -196, 372 and 309?

1. 634

2. 403

3. 568

4. 227