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Kaylis [27]
3 years ago
11

A die is rolled 23 times and the number of twos that come up is tallied. If this experiment is repeated many times, find the sta

ndard deviation for the number of twos.
19.2
1.8
2.4
5.8
Mathematics
1 answer:
Anon25 [30]3 years ago
7 0

The probability of rolling a 2 is 1/6. If X is a random variable representing the number of 2s that are obtained after rolling a die 23 times, then X follows a binomial distribution with success probability p = 1/6 across n = 23 trials.

The variance of a binomial distribution with parameters p and n is n p (1 - p), so the standard deviation in this case would be

√(23 • 1/6 • 5/6) ≈ 1.8

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Answer:

The graph where the red point has a meaning is the graph C or third graph.

Step-by-step explanation:

As we can see the first and second graphs are irrelevant and have no relation between the x axis and y axis.

In graph A, the bird feeder graph is shown where the quart is a unit for liquids and pounds is a unit for solids. Thus, the red point cannot be defined.

Similarly, in graph B, height and team numbers are not related to each other in any way, so not clear meaning can be withdrawn here,

In graph C, the relation between cost of pictures and number of pictures are shown. We can very well understand here, that as the number of pictures increases, the cost increases.

So, the graph where the red point has a meaning is the graph C or third graph.

4 0
3 years ago
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Answer:

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Step-by-step explanation:

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Let n = number of records.

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Answer: She bought 3 records.

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3 years ago
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Omg what level are you that is so hard
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