A stragitic defense strategy calls for missiles to be fired independelty at a target until the target us hit. Let the probability that any missile will hit the target be .8 and x=# of missiles fired at the target

Points:

The question is incomplete as the value of x is not given and what is required is not stated.

However, I'll assume that x = 5

Going by the details of the question, possible questions could be:

See Explanation

Step-by-step explanation:

Given

Represent the probability with p.

So:

Solving (a): The expected number of hits.

In probability, the expected number is calculated as:

Substitute values for p and x

Remember that 5 is an assumed value of x

Hence, the expected number of hits when 5 missiles is fired is 4

Solving (b): Variance

In probability, variance is calculated as:

Substitute values for p and x

Hence, the variance is 0.8

Solving (c): The standard deviation

In probability, the standard deviation is calculated as:

Substitute values for variance

Hence, the standard deviation is 0.89

go on the tube you might find some information there

sorry can't

step-by-step explanation:

i googled though and something came up but it was in science langueage not common english sooo