R = 9
lmk if you need the work
good luck ^^
520/104=5/1=6,5/1,3=k, where k=5
Answer:
The correct answer is:
(a) Mean = 170,
Standard deviation = 30
(b) 1700
Step-by-step explanation:
Given:
(a)
Mean of monthly expenses will be:
=
=
=
Standard deviation will be:
=
=
=
(b)
The total amount of monthly expenses will be:
=
=
=
Answer:
2
8
+
1
4
+
2
1
Step-by-step explanation:
you distribute the 7 through the whole problem
There are 45C4 = 148,995 ways to choose 4 calculators out of a group of 45.
There are 33C4 = 40,920 ways to choose 4 calculators that are not defective.
The probability that at least one is defective is (148,995 -40,920)/148,995 ≈ 0.725.