Standard deviation = √(n * p * q)
You are given n and p
q = 1 - p
q = 1 -0.2 = 0.8
Standard deviation = √(21 * 0.2 * 0.8)
=√3.36 = 1.83
The answer is A.
Answer:
Part 1) 
Part 2) 
Part 3) 
Step-by-step explanation:
step 1
Find the value of x
we know that
The sum of the interior angles in any triangle must be equal to 180 degrees
so
In the triangle ABC

substitute the given values

Solve for x


step 2
Find the measure of angle B
we know that

substitute the value of x

step 3
Find the measure of angle C
we know that

substitute the value of x
Answer:
B
Step-by-step explanation:
the cost of goods sold in 2017 is
19,000−(19,000×0.082)=17,442
Find the price before the 15% profit:
2500 / 1.15 = 2173.91
Now multiply the original cost by 1 + 38%:
2173.91 x 1.38 = 2999.99
Answer: 2.999.99 ( may need to round to 3,000)