Mean

Q.

How do you find the mean?

Q. Find the mean of the following data.

4

5

6

7

8

3

1. 5.5
2. 5
3. 6

Q. Average of 6, 6 and 6 is ___.

1. 3
2. 6
3. 12
4. 18

Q. Find the average of all factors of 10.

1. 4.5
2. 4
3. 2.5
4. 3

Q. The mean height of 10 students is 150 cm.
Which of these heights of the students is more than the mean height?

1. 145 cm
2. 150 cm
3. 152 cm
4. 155 cm
5. 148 cm
6. 153 cm
7. 154 cm
8. 147 cm
9. 151 cm
10. 147 cm

Q. While calculating the mean of $3$ single-digit numbers, Xavier mistakenly replaced the number $6$ by $9$, and obtained the mean as $5$. Find the actual mean of the data set.

1. 4

Q. X and Y are two rival toy companies, and the number of toys they each produced over 6 years is as shown below.

Find the average toys produced by X and Y during these years.

1. Company X = 14, 000
   Company Y = 16, 333
2. Company X = 18, 500
   Company Y = 12, 000
3. Company X = 16, 333
   Company Y = 14, 000
4. Company X = 12, 000
   Company Y = 18, 500

Q. A ladder has rungs 25 cm apart. The rungs decrease uniformly in length from 45 cm at the bottom to 25 cm at the top. If the top and bottom rungs are 2.5 metre apart, what is the length of the wood required for the rungs?

1. 2 metres
2. 3.5 metres
3. 9 metres
4. 12.5 metres

Q. The number of computers available in different labs of a school are $1,4,2,x,y\text{and}z,$ where $x<y<z$.

Determine the values of $x,y\text{and}z$.

Given:
Median= $3.5$
Mode= $4$
Mean= $4.5$

1. $x=13$
   $y=4$
   $z=3$
2. $x=3$
   $y=4$
   $z=13$

Q. For the given set of data of the number of pretzels sold for a week, Sophia says that the mean will lie between 5 and 35.
Thomas says that it will be greater than 35.
Timothy says it that will be lesser than 5.
Who is correct?

1. Thomas
2. Sophia
3. Timothy
4. None of them

Q.

One fifth of 15 is ____

1. 1

2. 7

3. 3

4. 5

Q. Sam does his homework from $12:00\text{PM}$ to $2:45\text{PM}$. If each assignment takes 15 minutes, how many assignments can he complete?

Q. Jenny and her friends are estimating the mean score of a tennis match, as shown below.

10

12

14

16

18

20

22

24

Jenny: 12
Ena: 18
James: 30
Roy: 24
Whose estimation is absolutely incorrect?

1. Jenny
2. Ena
3. James
4. Roy

Q. In a firm, there are two manufacturers - Oliver and Elijah. Oliver has $2$ machine, which are capable to produce $6$ finished goods in a day. Whereas, Elijah has $7$ machines, which produce $21$ finished goods per day. Which manufacturer has more efficient machines?

1. Machines of Elijah are more efficient.
2. Machines of both Oliver and Elijah are equally efficient.
3. Cannot be determined.

Q. Max's score for the term exam is as shown below:

Subject	Score
English	98
Mathematics	78
Science	88

What is his mean score?

1. 88
2. 106
3. 92
4. 85

Q.

Find the mean of the following data:

$x$	$19$	$21$	$23$	$25$	$27$	$29$	$31$
$f$	$13$	$15$	$16$	$18$	$16$	$15$	$13$