Total amount of muffins: 3×6= 18 muffins.
Amount of muffins without nuts:
total amount of muffins - muffins with nuts
18-3= 15 muffins without nuts
Answer:
B) μD = 0.60 ± 0.10(1.397)
Step-by-step explanation:
The confidence interval is given by:

Where
MD=60
n=9
df=n-1=8


Then the confidence interval is
μD=0.60±1.397*(0.3/√9)
μD=0.60±0.10*(1.397)