you practice the piano for 30 min. each day. Write and solve an equation to find the total time t you spend practicing the piano
2 answers:
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Answer:
NP =
Step-by-step explanation:
Since MP is an angle bisector then it divides the sides/ base in the ratio.
=
, substitute values
=
( cross- multiply )
18NP = 64 ( divide both sides by 18 )
NP = =
Answer:
At least 832 teenargers must be interviewed.
Step-by-step explanation:
We have that to find our level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of .
So it is z with a pvalue of , so
Now, find the margin of error M as such
In which is the standard deviation of the population and n is the size of the sample.
How many teenagers must the firm interview in order to have a margin of error of at most 0.1 liter when constructing a 99% confidence interval
At least n teenargers must be interviewed.
n is found when M = 0.1.
We have that
So
Rounding up
At least 832 teenargers must be interviewed.