An article in the The Canadian Entomologist reported on the

An article in the The Canadian Entomologist reported on the life of the alfalfa weevil from eggs to adulthood. The following table shows the number of larvae that survived at each stage of development from eggs to adults. 1. What is the probability an egg survives to adulthood? 2. What is the probability of survival to adulthood given survival to the late larvae stage? 3. What stage has the Wand probability of survival to the next stage?

Solution

1)

probability that egg survives to adulthood = number of adults/number of eggs

= 31/421 = 0.0736

2)

probability of survival toa dulthood given survival to late larva stage

= number of adults/number of late larvae

= 31/306 = 0.1013

3)

as one can see many larve died during pre-pupae stage , hence it has lowest survival probability to next stage