Answer:
what's the question ndndn
If 5/11 are girls, then 6/11 are boys (the total has to be 11/11, which equals 1).
Multiply the fraction of boys by the total number of students.
(6/11)*1551 = 846
Therefore, 846 of the students in the school are boys.
Answer:
C. 20
Step-by-step explanation:
45 + 5x + 35 = 180
5x + 80 = 180
subtract 80 from both sides
5x = 100
divide by 5
x = 20
Answer:
The 95 percent confidence interval for the true mean metal thickness is between 0.2903 mm and 0.2907 mm
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.

The lower end of the interval is the sample mean subtracted by M. So it is 0.2905 - 0.0002 = 0.2903 mm
The upper end of the interval is the sample mean added to M. So it is 0.2905 + 0.0002 = 0.2907 mm
The 95 percent confidence interval for the true mean metal thickness is between 0.2903 mm and 0.2907 mm
Answer:
can you please give more info
Step-by-step explanation: