I believe it's a rational number, since it's an integer.
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:
1.787
Step-by-step explanation:





Now putting the value of√2




Answer:
120 + 10x
or
10(12 + x)
Step-by-step explanation: