2 years ago

Helppppppp!!!!!!!!!!! :(

1 answer:

Taya2010 [7]2 years ago

8 0

I can only do the second one:

a) 12/25

b) 3 1/5

c) 2 7/10

I just used a scientific calculator so sorry if I'm wrong!

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$f(x) = \mu e^{-\mu x}$

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This means that $m = 23, \mu = \frac{1}{23} = 0.0435$

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P(X > 10) = 0.6473

(b) P(X >20)

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P(X > 20) = 0.4190

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P(X < 30) = 0.7288

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$0.05 = e^{-0.0435x}$

$\ln{e^{-0.0435x}} = \ln{0.05}$

$-0.0435x = \ln{0.05}$

$x = -\frac{\ln{0.05}}{0.0435}$

$x = 68.87$

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