Recent questions tagged ch15

The mean and standard deviation of six observations are $8$ and $4$ respectively. If each observation is multiplied by $3$, find the new mean and new standard deviation of the resulting observation.

asked Jul 1, 2014 by meena.p

1 answer

The mean and variance of $7$ observation are $8$ and $16$ respectively.If six of the observations are $2,4,10,12,14$. Find the remaining two observations.

asked Jul 1, 2014 by meena.p

1 answer

The mean and variance of eight observation are $9$ and $9.25$ respectively.If six of the observations are $6,7,10,12,12$ and $13$. Find the remaining two observations.

asked Jul 1, 2014 by meena.p

1 answer

The sum and sum of squares corresponding to length x (in cm) and weight (y) in gm of 50 plant products are given below: $ \sum \limits _{i=1} ^{50} x_i=212, \qquad\sum \limits_{i=1}^{50}x_i^2 =902.8;\qquad \sum \limits _{i=1} ^{50} y_i=261, \qquad\sum \limits_{i=1}^{50}y_i^2 =1457.6$ Which is more varying , the length or weight?

asked Jul 1, 2014 by meena.p

1 answer

The following is the record of goals scored by team A in a football session. For Team B , mean number of goals scored per match was 2 with a standard deviation 1.25 goals. Find which team may be considered more consistent ?

asked Jul 1, 2014 by meena.p

1 answer

An analysis of monthly wages paid to workers in two firms A and B , belonging to the same industry, gives the following results. (i) Which firm A and B pays larger amount as monthly wages. (ii) which firm A or B shows greater variability in individual wages?

asked Jul 1, 2014 by meena.p

1 answer

From the prices of shares A and Y below. Find out which is more stable in value.

asked Jun 30, 2014 by meena.p

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From the data given below state which group is more variable A or B?

asked Jun 30, 2014 by meena.p

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The diameters of circles(in mm) drawn in a design are given below . Calculate the std. deviation and mean diameter of the circles.

asked Jun 30, 2014 by meena.p

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Find mean and variance and standard deviation using short cut method.

asked Jun 30, 2014 by meena.p

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Find mean and variance for the following frequency distribution :

asked Jun 27, 2014 by meena.p

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Find mean and variance for the following frequency distribution :

asked Jun 27, 2014 by meena.p

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Find mean and standard deviation using short - cut method.

asked Jun 27, 2014 by meena.p

1 answer

Find mean and variance of the data:

asked Jun 27, 2014 by meena.p

1 answer

Find mean and variance of the data:

asked Jun 27, 2014 by meena.p

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Find first 10 multiples of 3

asked Jun 27, 2014 by meena.p

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First n natural numbers:

asked Jun 26, 2014 by meena.p

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Find the mean and variance for each of the data : $6,7,10,12,12,4,8,12$

asked Jun 26, 2014 by meena.p

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Calculate the mean deviation about median for the age distribution of 100 persons given below.

asked Jun 26, 2014 by meena.p

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Find the mean deviation about the median for the following data :

asked Jun 26, 2014 by meena.p

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Find the mean deviation about the mean for data :

asked Jun 26, 2014 by meena.p

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Find the mean deviation about the mean for data :

asked Jun 26, 2014 by meena.p

1 answer

Find the mean deviation about the mean for data : $x_i :15,21,27,30,35 \qquad f_i : 3,5,6,7,8$

asked Jun 26, 2014 by meena.p

1 answer

Find the mean deviation about the mean for data : $x_i :5,7,9,10,12,15 \qquad f_i : 8,6,2,2,2,6$

asked Jun 25, 2014 by meena.p

1 answer

Find the mean deviation about the mean for data : $x_i :10,30,50,70,90 \qquad f_i : 4,24,28,16,8$

asked Jun 25, 2014 by meena.p

1 answer

Find the mean deviation about the mean for data : $x_i :5,10,15,20,25 \qquad f_i : 7,4,6,3,5$

asked Jun 25, 2014 by meena.p

1 answer

Find the mean deviation about the mean for the data $36,72,46,42,60,45,53,46,51,49$

asked Jun 25, 2014 by meena.p

1 answer

Find the mean deviation about the mean for the data $13,17,16,14,11,13,10,16,11,18,12,17$

asked Jun 25, 2014 by meena.p

1 answer

Find the mean deviation about the mean for the data $38,70,48,40,42,55,63,46,54,44$

asked Jun 25, 2014 by meena.p

1 answer