ninaaforever
05.08.2020 •
Mathematics
A local statistician is interested in the proportion of high school students that drink coffee. Suppose that 20% of all high school students drink coffee. What is the probability that out of these 75 people, 14 or more drink coffee?
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Ответ:
the probability that out of these 75 people, 14 or more drink coffee is 0.6133
Step-by-step explanation:
Given that:
sample size n = 75
proportion of high school students that drink coffee p = 20% = 0.20
The proportion of the students that did not drink coffee = 1 - p
Let X be the random variable that follows a normal distribution
X N (n, p)
X N (75, 0.20)
= 75 × 0.20
15
Now ; if 14 or more people drank coffee ; then
From the standard normal z tables; (-0.288)
the probability that out of these 75 people, 14 or more drink coffee is 0.6133
Ответ:
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