Answer:
-9
Step-by-step explanation:
-3(2) + (-3)
-6 + (-3)
-9
Answer:
Option C
Step-by-step explanation:
Given that for a random sample of 20 houses selected from a city showed that the mean size of these houses is 1880 square feet with a standard deviation of 320 square feet.
X, the sizes of houses is Normal
Hence sample mean will be normal with
Mean = 1880
and std dev = 
For 90% confidence interval critical value for t with degree of freedom 19 is
1.328
Confidence interval upper bound
= mean + margin of error
= 
Option C is right
Answer:
75
Step-by-step explanation:
did it 5 mins ago
Answer:
3
Step-by-step explanation:
z/12=18/72 z/12=1/4 z=3
Answer:
6.44444
Step-by-step explanation: