Question $1$:

The below table contains the data on the effect of a series of concentrations of rotenone when spraying on Macrosiphoniella sanborni, the chrysanthemum aphid, in batches of about fifty. Find the $L{D}_{50}$ using:

a$.$ Microsoft Excel

b$.$ Hand calculation using graph paper

c$.$ Plot $logC$ versus probit variable, $Y$ and find the straight$-$line equation using both hand calculations and Microsoft Excel.

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