Question
Find the constant ' $a$ ' and the probability that $X$ assumes an odd value.
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| Year | $2012$ | $2013$ | $2014$ | $2015$ | $2016$ | $2017$ | $2018$ |
| Wages $(₹)$ | $460$ | $500$ | $580$ | $600$ | $620$ | $710$ | $750$ |
| Cost of living index number | $100$ | $110$ | $118$ | $124$ | $135$ | $135$ | $140$ |