We use the simple rules of statistics to accept the null hypothesis
68% of the data falls within 1 sd of the mean95% of the data falls within 2 sd of the mean 99% of the data falls within 3 sd of the mean
20 falls between the range of -56 to 56 (from the given 95% c.i.), hence we accept the null hypothesis; else, if the mean falls outside the range, we reject the null hypothesis.
First find 60% of 145 =
60% of 45 equals 87.
Now subtract 87 from 145.
145 - 87 = 58
So there were 58 girls.
<u><em>The answer is 11/12.</em></u>
<u><em>I got the answer by subtracting 5/4-1/3 and the answer would be the answer to the problem.</em></u>
<u><em>Hope this helps!</em></u>
<u><em>:)</em></u>
Answer:
Step-by-step explanation:

since we know that
in this expansion is 
thus 
Hope that helps!