A) 49.67 kg
B) 50.01 kg
C) 53.23 kg
D) 57.23 kg
Correct Answer: A
Solution :
Here,\[{{n}_{1}}=15,\]\[{{n}_{2}}=30\] \[{{\bar{x}}_{1}}=45\,\,\text{kg}\]and \[{{\bar{x}}_{2}}=52\,\,\text{kg}\] \[\therefore \] \[\bar{X}=\frac{{{n}_{1}}{{{\bar{x}}}_{1}}+{{n}_{2}}{{{\bar{x}}}_{2}}}{{{n}_{1}}+{{n}_{2}}}=\frac{15\times 45+30\times 52}{15+30}=\frac{2235}{45}\,\,\text{kg}\] \[=49.67\,\,\text{kg}\] Hence, mean weight of entire class is 49.67 kgYou need to login to perform this action.
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