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madisonromney2819
17.10.2019 •
Mathematics
According to a report, 51.6% of murders are committed with a firearm. (a) if 200 murders are randomly selected, how many would we expect to be committed with a firearm? (b) would it be unusual to observe 122 murders by firearm in a random sample of 200 murders? why?
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Ответ:
a) 103, b) No
Step-by-step explanation:
a) We need to multiply the probability by the amount of the sample to get:
200 × 51.6% = 103.2, rounded down to 103
b) As we have selected the people randomly, we have no control over the type of people we are given - this is theoretical and the estimate is not definite - all of the sample could have murdered by firearm or even none (even though it is highly unlikely).
Ответ:
Answer
you have to divide 450/25
the answer will be 18