2 years ago

Choosing a 4-letter password using only 5 letters that may each be used more than once. How do you do this??

Mathematics

1 answer:

qwelly [4]2 years ago

3 0

I think that you either have to subtract both or multiply but i feel like its multiplying so I think its multiplying

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wlad13 [49]

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Step-by-step explanation:

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2 years ago

If ABCD is a parallelogram find the value of unknown size of angle

fiasKO [112]

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3 years ago

recent survey found that 71% of all adults over 50 wear glasses for driving. In a random sample of 30 adults over 50, what is

valentina_108 [34]

Answer:

Mean = 21.3

Standard Deviation = 2.48

Step-by-step explanation:

We are given the following in the question:

p = 71% = 0.71

Sample size, n = 30

We have to find the mean and the standard deviation of those that wear glasses.

$\text{Mean} = np\\=30(0.71)\\=21.3$

Thus, the mean of those who wear glasses is 21.3

$\text{Standard deviation} = \sqrt{npq}\\=\sqrt{np(1-p)}\\=\sqrt{30\times 0.71\times (1-0.71)}\\=2.48$

Thus, the standard deviation of those who wear glasses is 2.48

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