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 data set of size 15 is
The correct answer is A
4.7 × 3.5 + 4.2 × 4.5 = 22.5 × 3.5 - ?
{(420 ÷ 28)% of 1400} ÷ 7 = ?
What will be the value after simplifying this continued fraction?
40% of (362 ÷ 0.05) = ?
If 0.17a = 11.9, find the value of a.
322 – 182 + 11 × 24 = ?
((67)32 × (67)-18/ ? = (67)⁸
6 0 - 20 [8 + 12 {8-8 (20-12)+20}-40] ÷ 16 =?
(√121 + √196) × 7 =? × 5
