In a laboratory, 40 white rats were kept for experiments, out of which 15 died due to some infections in the previous year. The death rate of white rats in this population is _____________.

0.375

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3.75

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2.66

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0.26

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Solution

The correct option is A 0.375
Death rate of a population is the number of deaths per capita. It is calculated as the numbers of deaths with respect to the initial number of individuals of the population.
$D e a t h r a t e = \frac{N u m b e r o f i n d i v i d u a l s d i e d}{I n i t i a l s i z e o f t h e p o p u l a t i o n}$

Initial population of white rats = 40
Number of death of white rats = 15
$D e a t h r a t e = \frac{15}{40} = 0.375$

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