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loris [4]
2 years ago
10

katie pays $725 a month for rent, $40 for cable and $3.60 an hour for local telephone service. if his monthly expenditures last

month were $826.20 how much time did he spend on the phone.
Mathematics
1 answer:
Nuetrik [128]2 years ago
8 0
The answer would be: He spent 17 hours on the phone
Explanation: $826.20 - $725= $101.2 - $40= $61.12 / $3.60= 17hrs
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A drug company conducts trials of a new vaccine for a rare but usually fatal disease. The company creates a
GalinKa [24]

Answer:

What can be said about the model are;

1) The company predicts 4 failures before success

2) Each trial is independent

3) The probability is the same for each trial

4) Success is defined as preventing the disease

Step-by-step explanation:

The probability of success for the vaccine, p = 0.2

Therefore, the probability that the vaccine is effective and prevents the disease = 0.2

A geometric distribution probability of success is given by the following formula;

P(X = x) = p × q⁽ˣ⁻¹⁾

The expected value, E(Y) = 1/p

The number of failures before success, E(Y) = (1 - p)/p = (1 - 0.2)/0.2 = 4

Where;

q = The probability of a trial failing = 1 - p = 1 - 0.2 = 0.8

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∴ The e

The geometric model criteria are;

a) Each trial can only have one of two outcomes success or failure

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c) The geometric distribution is concerned with finding how many trials are required to get one success

d) The trials are independent

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The number of failures the company predicts before a success = 4 failures

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4) Success is defined by the effectiveness of the vaccine in the prevention of the disease

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