Teaching UGC NET Mock Test Series 2025 (Paper 1 & 2) Business Statistics and Research Methods Measures of dispersion
The 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:
1
\(\sqrt{\frac{72}{5}}\)
2
\(\sqrt{\frac{66}{5}}\)
3
\(\sqrt{\frac{70}{5}}\)
4
\(\sqrt{\frac{68}{5}}\)