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?
1 answer:
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
<span>2 to 3 students will get greater than 20 measurement</span>
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100/10.5= 10
hope this helps
Answer:
Step-by-step explanation:
To find the answer convert the amount kilograms you have to grams
Answer:
x = ± 
Step-by-step explanation:
3x² + 7 = 28 ( subtract 7 from both sides )
3x² = 21 ( divide both sides by 3 )
x² = 7 ( take square root of both sides )
x = ±
that is x = - , x =
Answer:
By multiplying
If the sides were 5 then you would do 5x5 to get the area
Hope this makes sense :)
