Answer : - 4 + 3 = - 1
- 2 + 3 = 1
By half gives - 1/2 and 1/2
So midpoint (-1/2, 1/2)
Variance of a continuous random variable X is defined as
Standard deviation is defined as

Hence standard deviation is the positive square root of variance.
Answer:
650 Country A Dollars
Step-by-step explanation:
1 Country B Dollar = 1.3 Country A Dollar
Country A Dollars for 500 Country B Dollars = 500 x 1.3 = 650