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:
c.
Step-by-step explanation:
Negative numbers are always less than positive numbers. 3/10 is less that 1/4:
Making the answer c.
Maria. You can check by dividing 8 into 3 and 3 into 8.
Answer:
1.875kg
Step-by-step explanation:
48 - 1000g
90 - x
48x = 90000
x = 90000/48
= 1875g = 1.875kg
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Answer:
58000m
Step-by-step explanation:
he ran 35.5km+22.5km=58km
58km(1000m/km)=58000m