A normal variable $X$ has the probability density function as :$f(x)=\frac{011}{10 \sqrt{2 \pi}} e^{-\frac{1}{2}\left(\frac{x-100}{10}\right)^2} ;-\propto$
If $b_{s,}=0.8$ then find the value of $b_{v t}$ for the following $u$ and $v : (1)\ u=x \quad 105$ and $v=y-90\ (2)\ u=\frac{x-1400}{100}$ and $v=\frac{y-750}{50}$
The cost of living index number increased from $280$ to $340$ during a certain time period and the wage increased from $₹ 13,500$ to $₹ 14,750$. Find the real gain of loss of the worker.