Suppose that a coin has been altered to come up heads 80% of the time. If many samples of 60 coin flips are taken, which of the
2 answers:
Answer:
<h2>There are gonna be 48 heads after 60 coin flips with those altered coins.</h2>Step-by-step explanation:
Givens
- The coind has 80% chnages to come up heads.
- There are 60 coins.
If there 60 coins flips, the number heads would probably be
Therefore, there are gonna be 48 heads after 60 coin flips with those altered coins.
Remember that the percentage represents the probability of getting heads in one trial, if we make several trials, we must multiply that number with the probability of the single event.
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Based on the data set, the variance for this sample of tests is 4
<h3>How to find the variance for this sample of tests?</h3>The sample of test is given as:
78, 79, 79, 81, and 83.
Calculate the mean, using:
Mean = Sum/Count
So, we have
Mean = (78 + 79 + 79 + 81 + 83)/5
Evaluate
Mean = 80
The variance is calculated as
This gives
= [(78 - 80)^2 + (79 - 80)^2 + (79- 80)^2 + (81- 80)^2 + (83- 80)^2)]/[5 - 1]
Evaluate the numerator and the denominator.
So, we have:
=16/4
Evaluate the quotient
= 4
Hence, the variance for this sample of tests is 4
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