Answer:
By the Empirical Rule, 
Step-by-step explanation:
The Empirical Rule states that, for a normally distributed random variable:
68% of the measures are within 1 standard deviation of the mean.
95% of the measures are within 2 standard deviation of the mean.
99.7% of the measures are within 3 standard deviations of the mean.
The symbol of a standard deviation is
. So
When plotting sample statistics on a control chart, 99.7% of the sample statistic values are expected to fall within plus/minus how many sigma?
By the Empirical Rule, 
Answer:
(-2, -3)
Step-by-step explanation:
solutions are all the points where the line intersects
The answer is D. Because you need to add not subtract.
Answer: angle p = 124°
Step-by-step explanation: Angle W and angle P are opposite interior angles so they have the same measure.