| \[\mu =4/3\] |
| \[\mu =3/2\] |
A) 1.8
B) 1.43
C) 2
D) None of the above
Correct Answer: B
Solution :
\[\mu =\frac{\sum {{t}_{i}}}{\sum \frac{{{t}_{i}}}{{{\mu }_{i}}}}\] \[\mu =\frac{{{t}_{1}}+{{t}_{2}}}{\frac{{{t}_{1}}}{{{\mu }_{i}}}+\frac{{{t}_{2}}}{{{\mu }_{2}}}}=\frac{10+15}{\frac{10}{4/3}+\frac{15}{3/2}}\] \[=\frac{25}{7.5+10}=\frac{25}{17.5}=1.43\]
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