please share your explaination or calculation. Although the ans is 1.
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Sidha pehle weighted avg of SD nikalo. It will give you 14.4 . When normal weighted avg of SD se real SD aa jayega, it means correlation is 1 or no benefit of diversification.
this is the long method
but if you observe the options there is either perfect positive, perfect negative or no correlation
so you can try by options too and first go with weighted avg …