Joelle ordered 12 dozen doughnuts for the honor roll breakfast at the middle school.

3/8 of the doughnuts have chocolate icing.

1/4 of the doughnuts have white icing with sprinkles.

1/6 of the doughnuts have pink icing.

The rest are plain glazed doughnuts

How many doughnuts are plain glazed doughnuts

A. 76
B. 54
C. 114
D. 30
HELP

Researchers were interested in whether relaxation training decreases the number of headaches a person experiences. they randomly assigned 20 participants to a control group or a relaxation training group and noted the change in number of headaches each group reported from the week before training to the week after training. which statistical analysis should be performed to answer the researchers' question?

Select the margin of error that corresponds to the sample mean that corresponds to each population: a population mean of 360, a standard deviation of 4, and a margin of error of 2.5%

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