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Let the no. of 5p, 10p, 25 p coins be 3x, 4x & 6x respectively. Then sum of their values = Rs. [{5 x (3x/100) + 10 x (4x /100) + 25 x (6x/100)}] =Rs. [(15x/100) + (40x /100) + (150x/100)] =Rs. (15x + 40x + 150x/100) = Rs. (205x /100) Therefore, 205x /100 = 82 x = 82 x (100/205) x = 40 Hence the no. of 10p coins = 4x = 4 x 40 = 160
For the study purpose, the mean of the observations is 148 gm and standard deviation is 17.4 gm. Approximately, the coefficient of variation equals to:
Following two statements are related to regression coefficient
(I) Independent of the change of origin
(II) Independent of the change of scale
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For the recorded observation, the coefficient of variation is 0.2 and the variance is 16. The arithmetic mean is:
If the random sample of size n is drawn without replacement from a finite population of size N, the correction factor for standard error of sample mean...
Two data set of size 9 and 6 have standard deviation 3 and 4 respectively and arithmetic means 3 and 3 respectively. The standard deviation of combined...
The arithmetic mean of the following frequency distribution of number of accidents X on week working days is:
X:Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â...
The grouped data for the observation are as follows.
Class :Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â Â 2-4Â Â Â Â Â Â Â Â 4-6Â Â Â Â Â Â Â Â Â 6-8...
Five persons A, B, C, D and E occupy seats in a row at random. The probability that A and B sit next to each other is:
