Question
'Amit' purchased 'x' articles at the rate of Rs. 80 per
article. He sold the articles such that 1st article is sold for Rs. 2, 2nd article is sold for Rs. 4, 3rd is sold for Rs. 6, and so on. He earned an overall profit of 50%. If considering a certain case in which 'Bunti' purchased (x + 6) articles for Rs. 40 each and sold all the articles at the profit of 80%, then find the selling price of all the articles sold by 'Bunti' in this particular case.Solution
According to the question, Cost price of 'x' articles = Rs. 80x Selling price of last article = 2 X x = Rs. '2x' {Since, selling price of first article is Rs. 2, second article is Rs. '4', third article is Rs. '6'} Now, 2 + 4 + 6 + .... + 2x = 1.5 X 80x Or, 2(1 + 2 + 3 + .... + x) = 120x Or, (2/2) X {x(x + 1) } = 120x Or, x2Â + x = 120x Or, x2Â - 119x = 0 Or, x(x - 119) = 0 Or, x = 119 Therefore, number of articles purchased by 'Bunti' = (x + 6) = 125 Required selling price = 1.8 x 125 x 40 = Rs. 9000
Completely randomized design is based on the principles of _________ and randomization only.
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:
The second quartile for the following data 38, 39, 40, 52, 59, 67, 73, 77, 149, 248 is:
The arithmetic mean of the following frequency distribution of number of accidents X on week working days is:
X:               �...
The variation among the observations of each specific class is known as:
For the following frequency distribution
Class :                 3-5        5-7         7-9      �...

If the first, second and third moment about origin are 2, 8 and 14. respectively, then Karl Pearson gamma coefficient of skewness y1 is:
Following two statements are related to regression coefficient
(I) Independent of the change of origin
(II) Independent of the change of scale
Â
The memory-less property is followed by which of the following continuous distribution: