Fill In The Blanks[1 Marks ]

Question 11 Mark

Mean of $n$ observation is $\bar{x}$. If $1,2,3 \ldots .$. are adding in each observation respectively then mean of new observation is
$\left(\left(\bar{x}+\frac{n+1}{2}\right), \bar{x}+\frac{n}{2}, \bar{x}+\left(\frac{n+1}{4}\right)\right)$

Answer

$=\bar{x}+\left(\frac{n+1}{2}\right)$

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Question 21 Mark

In formula of median $M =l+\left(\frac{\frac{n}{2}-c f}{f}\right) \times h$ value $c f=\ldots \ldots \ldots .\left(\frac{n}{2}, f, c f\right)$

Answer

$cf$

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Question 31 Mark

If the mode of observation $6$ of $64,40,48, x, 43,48,43$ and $34$ is $43$ then $x+3=\ldots \ldots \ldots . .(51,45,46)$

Answer

$46$

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Question 41 Mark

In usual notation if $l=125, n=68, c f=22, f=20$ and $h=20$ then median $=\ldots \ldots . .(113,127,137)$

Answer

$137$

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Question 51 Mark

Mean of first $n$ even natural numbers is .......... . $\left((n+1),\left(\frac{n+1}{2}\right),(n(n+1))\right.$

Answer

$n+1$

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Question 61 Mark

In usual notation if $a=47.5, \Sigma f_i=30, \Sigma f_i u_i=29$ and $h=15$ then $\bar{x}=\ldots \ldots \ldots . .(95,62,68)$

Answer

$62$

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Question 71 Mark

If $\bar{x}-$ median $=4$ and $\bar{x}+$ median $=140$ then median $=\ldots \ldots \ldots . . .(72,140,68)$

Answer

$68$

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Question 81 Mark

Mean of following frequency distribution is 2.6 then $y=\ldots \ldots \ldots . .(2,4,8)$

$x_(i)$	$1$	$2$	$3$	$4$	$5$
$f_(i)$	$4$	$5$	$y$	$1$	$2$

Answer

$8$

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Question 91 Mark

$x_i=y_i+3, a=15, \bar{x}=15$ then $\bar{y}=\bar{x}+\ldots \ldots \ldots .(3,(-3),(-5))$

Answer

$-3$

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Question 101 Mark

For observations $1, 2, 3, 4,$ $\sum_{i=1}^4 x_i{ }^2=\ldots \ldots .(30,20,10)$

Answer

$30$

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Question 111 Mark

If $\bar{x}=6.45, \Sigma f_i=100, \Sigma f_i x_i=\ldots \ldots . .(645,6.45,64.5)$

Answer

$645$

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Question 121 Mark

Modal class is _______ of the following frequency distribution table.

class	$0-30$	$30-60$	$60-90$	$90-120$	$120-150$
freq.	$11$	$6$	$18$	$7$	$9$

$(30-60,90-120,60-90)$

Answer

$60-90$

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Question 131 Mark

Mean is _______ of first five natural numbers. $(15,3,5)$

Answer

$3$

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Question 141 Mark

Median class is _______ of the following distribution table.

class	$15-Oct$	$15-30$	$30-45$	$45-60$	$60-75$$
freq.	$8$	$7$	$12$	$10$	$2$

$(60-75,30-45,15-30)$

Answer

$30-45$

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Question 151 Mark

In mean formula $\overline{ X }=a+\frac{\Sigma f_i u_i}{\Sigma f_i} u_i=$_______ $\left(x_i-a, \frac{x_i-a}{h}, \frac{x_i-h}{a}\right)$

Answer

$\frac{x_i-a}{h}$

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Question 161 Mark

Modal class is _______ of the following frequency distribution table.

class	$0-5$	$5-10$	$10-15$	$15-20$	$20-25$
freq.	$3$	$5$	$8$	$7$	$6$

$(15-20,10-15,15-20)$

Answer

$10-15$

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Question 171 Mark

In the following frequency distribution. the modal class is..........

Class	10-20	20-30	30-40	40-50	50-60
Frequency	7	6	16	12	10

( 40 - 50, 50 - 60, 30 - 40)

Answer

30-40

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Question 181 Mark

For a given data 2, 6, 4, 5, 0, 3, 1, 3, 2, 3, mode=___________. (2,3,4)

Answer

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