A) 5
B) 10
C) 15
D) 20
Correct Answer: C
Solution :
Let the 20 items be\[{{x}_{1}},{{x}_{2}},........{{x}_{20}},\]then sum of these \[={{x}_{1}}+{{x}_{2}}+..........{{x}_{20}}=20\times 5=100\] Multiplying each item by 3 and adding the result, we get \[3{{x}_{1}}+3{{x}_{2}}+..........3{{x}_{20}}=3\times 20\times 5=300\] Hence, the new mean \[=\frac{300}{20}=15.\]
You need to login to perform this action.
You will be redirected in
3 sec
