Two data sets of sizes 6 and 9 have standard deviation 3 and 4, respectively, and arithmetic means 4 and 4, respectively. The standard deviation of combined data set of size 15 is:
The correct answer is D
If each of the odd digits in the number ' 78343724' is decreased by 1 and each of the even digits is increased by 1, which of the following will be the...
Select the option that is related to the third number in the same way as the second number is related to the first number.
25:16::41:?
If each of the letters in the English alphabet is assigned odd numerical value beginning A = 1, B = 3 and so on, what will be the total value of the let...
If 2 is added to all the odd place digits and 1 is subtracted from all even place digits (from the left end) in ‘634715247’ and then all the digits ...
Four number-pairs have been given, out of which three are alike in some manner and one is different. Select the number-pair that is different.
If digits of each number are added and sum is multiplied by 4, and the resultants are arranged in descending order, which number will be at last position?
If first and last digit of each number is multiplied and then the product is added to the sum of the middle two digits of the number, which resultant nu...
The average salary of A, B and C is Rs. 22000 while average salary of B, C and D is Rs. 25000. If the average salary of D be 2 times of that of ...
Select the number that can replace the question mark (?) in the following series. 17, 21, 30, 46, 71, ?
