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Ivahew [28]
3 years ago
10

A particular strain of bacteria doubles in population every 10 minutes. Assuming you start with a single bacterium in a petri di

sh, how many bacteria will there be in 2.5 hours
Mathematics
2 answers:
Amanda [17]3 years ago
8 0
22,500 bacteria will be in 2.5 hours
SVEN [57.7K]3 years ago
4 0

Let the initial number of bacteria be x_{0}

Number of bacteria doubles in population every 10 minutes

After 10 minutes number of bacteria = 2x_{0}

number of bacteria present after t minutes,

x = x_{0}\times2^{t}

When t = 2.5 hrs = 2.5 (60) = 150 minutes

So every 10 minutes t = 150/10 = 15

Now substitute t = 15 minutes and x_{0} = 1, we get

x = 1\times2^{15}

x = 32,768 bacteria



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Samir is an expert marksman. When he takes aim at a particular target on the shooting range, there is a 0.950.950, point, 95 pro
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Step-by-step explanation:

For each target, there are only two possible outcomes. Either he hits it, or he does not. The probability of hitting a target is independent of other targets. So 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}

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And p is the probability of X happening.

0.95 probaiblity of hitting a target

This means that p = 0.95

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This means that n = 10

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Either he hits all the targets, or he misses at least one of them. The sum of the probabilities of these events is decimal 1. So

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We want P(X < 10). So

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P(X = 10) = C_{10,10}.(0.95)^{10}.(0.05)^{0} = 0.5987

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40.1% probability that he will miss at least one of them

7 0
2 years ago
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