sonyav732
22.09.2019 •
Mathematics
Suppose the same quantity is measured but with a more precise method giving an average and standard deviation of 15.0 ± 2.5. how many students out of 100 would you now expect to get a measurement greater than 20?
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Ответ:
To solve this, we use the z test.
The formula:
z = (x – u) / s
where x is sample value = 20, u is the mean = 15, and s is the standard deviation = 2.5
z = (20 – 15) / 2.5
z = 2
Since we are looking for values greater than 20, this is right tailed test. We use the standard distribution tables to find for P.
P = 0.0228
Therefore:
number of students = 100 * 0.0228 = 2.28
2 to 3 students will get greater than 20 measurement
Ответ:
Step-by-step explanation:
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