Mathematics, 26.12.2019 05:31 Caleb0018
Aparticular concentration of a chemical found in polluted water has been found to be lethal to 40% of the crayfish that are exposed to the concentration for 24 hours. 22 crayfish are placed in a tank containing this concentration of chemical in the water.
(a) what is the probability that 13 or 17 survive?
(b) what is the probability that at least 17 survive?
(c) what is the probability that at most 16 survive?
(d) what number of crayfish are expected to survive?
(e) what is the variance in the number of crayfish that are expected to survive? no actual crayfish were harmed in the making of this question.
Answers: 3
![P(X \leq 16)=1-P(X16)=1-P(X\geq 17) = 1-[P(X=17)+P(X=18)+P(X=19)+P(X=20)+P(X=21)+P(X=22)]](/tpl/images/0433/4708/54d63.png)
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