Answer:
DEF is a right angle
Step-by-step explanation:
<h2>
Answer with explanation:</h2>
As per given , we have


n= 64
a) Since , the sample mean is the point estimate for the population mean.
Therefore, the point estimate of the population mean =
b) Critical z-value for 99% confidence : 
Confidence interval :




Hence, the 99 percent confidence interval for the population mean is between 7.46 and 8.88.
Answer:
the answer is 1
Step-by-step explanation:
1.25, 2 and 1.5 are too big compare to 1
Check the picture below.
Make sure your calculator is in Degree mode.
Double of 50 is 100, so 28*100=2800, now half of the answer is 2800/2=1400