Question 1 :
While computing mean of grouped data, we assume that the frequencies are
Question 2 :
The sum of 15 observations of a data is (434+x). If the mean of the data is x, then find x.<br/>
Question 3 :
If M and $\displaystyle M_{g}$ represents the mean of the raw and grouped data respectively then
Question 4 :
Frequency distribution of daily commission received by 100 salesmen is given.<br/><table class="wysiwyg-table"><tbody><tr><td>Daily commission (in Rs.)</td><td>$100 - 120$</td><td>$120 - 140$</td><td>$140 - 160$</td><td>$160 - 180$</td><td>$180 - 200$</td></tr><tr><td>No. of salesman</td><td>$20$</td><td>$45$</td><td>$22$</td><td>$9$</td><td>$4$</td></tr></tbody></table>Find mean daily commission received by a salesman.<br/>
Question 5 :
Calculate the mean profit for each crop over the 4 years.
Question 7 :
Find the missing value of P for the following distribution whose mean is $12.58$<br/><table class="wysiwyg-table"><tbody><tr><td>$x_i$</td><td>5</td><td>8</td><td>10</td><td>12</td><td>P</td><td>20</td><td>25</td></tr><tr><td>$f_i$<br/></td><td>2</td><td>5</td><td>8</td><td>22</td><td>7</td><td>4</td><td>2</td></tr></tbody></table>
Question 8 :
Find the arithmetic mean of data for the following set of numbers ${23, 45, 34, 43,12, 2, 17, 9, 10}$
Question 9 :
The mean of 30, 32, 24, 34, 26, 28, 30, 35, 33, 25 is 29.7<br/>If true then enter $1$ and if false then enter $0$<br/>
Question 11 :
The mean of 11 number is 35 If the mean of the first 6 numbers is 32 and that of the last 6 numbers is 37 then the sixth number is
Question 13 :
<table class="wysiwyg-table"><tbody><tr><td>Class </td><td>0-20</td><td>20-40</td><td>40-60</td><td>60-80</td><td>80-100</td><td><br></td></tr><tr><td>Frequency</td><td>19</td><td>$f_1$</td><td>32</td><td>$f_2$</td><td>19</td><td>Total 120</td></tr></tbody></table>Mean of the above frequency table is given as $50$. Find $f_1$ and $f_2$.
Question 14 :
For the measures of central tendency, ................ of the following is not true.
Question 15 :
<table class="wysiwyg-table"><tbody><tr><td>x</td><td>10</td><td>15</td><td>20</td><td>25</td><td>35</td></tr><tr><td>f</td><td>6</td><td>p</td><td>26</td><td>10</td><td>8</td></tr></tbody></table>If means of the above is 21 then values of p is
Question 16 :
In a factory, the average salary of the employees is Rs. 70. If the average salary of 12 officers is Rs. 400 and that of the remaining employees is Rs. 60, then the number of employees are ...........
Question 17 :
If $m$ = $\dfrac{x_1 + x_2 + ..... + x_{20}}{20}$, <span>then the value of $\Sigma ^{20}_{i=l} \dfrac{(x_i - m)}{20} is$</span>
Question 18 :
Let set $M = \left \{x, 2x, 4x\right \}$ for any number $x$. If the average (arithmetic mean) of the numbers in set $M$ is $14$, find the value of $x$.
Question 19 :
The average weight of three boys P, Q and R is $\displaystyle 54\frac{1}{3}$ kg, while the average weight of three boys Q, S and T is 53 kg. What is the average weight of P, Q, R, S and T?
Question 20 :
The mean of the cubes of the first n natural numbers is