25 is 40% of what number?

Mathematics

2 answers:

andrew-mc [135]2 years ago

6 0

It would actually be 62.5

RUDIKE [14]2 years ago

3 0

25 is 40% of 62.5. I hope this helps!

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Answer:

0.96 = 96% probability that at least one of them detect an enemy attack.

Step-by-step explanation:

For each radar, there are only two possible outcomes. Either it detects the attack, or it does not. The missiles are operated independently, which means that we use the binomial probability distribution to solve this question.

Binomial probability distribution

The binomial probability is the probability of exactly x successes on n repeated trials, and X can only have two outcomes.

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

In which $C_{n,x}$ is the number of different combinations of x objects from a set of n elements, given by the following formula.

$C_{n,x} = \frac{n!}{x!(n-x)!}$

And p is the probability of X happening.

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This means that $p = 0.8$

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This is $P(X \geq 1)$ when $n = 2$ . So