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ira [324]
3 years ago
10

What is the relationship between the variance and standard deviation? variance is the positive square root of the standard devia

tion?
Mathematics
1 answer:
lana [24]3 years ago
6 0

Variance of a continuous random variable X is defined as

\int\limits_D {(x-\mu)^2f(x)} \, dx

Standard deviation is defined as

\sigma =  \sqrt{Var(X)}

Hence standard deviation is the positive square root of variance.

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If the exchange rate of 1 dollar is rs 72.45, how many dollar can be exchanged for rs 1449?
Shalnov [3]

Answer:

20

Step-by-step explanation:

1449÷72.45=20

4 0
3 years ago
Solve by completing the square and show steps <br> x^(2)+6x+5=0
Crazy boy [7]
X ^2 +6x+ 5
(x+2)(x+3)

2 + 3 = 5
While also 2•3= 6
The two numbers have to equal b when multiplied and c when added
4 0
3 years ago
Amy ran 3/4 a mile. Write the distance Amy ran as a decimal.
dem82 [27]
0.75 of a mile Amy ran
6 0
4 years ago
Read 2 more answers
Work out the area of the shaded region.
Makovka662 [10]

Answer: Area of the shaded region is 6.867 square cm

Step-by-step explanation:

The shaded area corresponds to the difference of the area of the rectangle and the area of the semicircle.

Area of the rectangle = 4 times 8 = 32 cm^2

Area of the semicircle = 0.5 * pi * r^2   (where r is the radius, i.e., half of the diameters, i.e., 4 cm). So Area = 0.5*pi*4^2 = 25.133 cm^2

The difference: 32 - 25.133 = 6.867 cm^2 (area of the shaded region)

5 0
3 years ago
The archway to the entrance of an art gallery can be model by y= -1/3(x-5)(x+5) where x and y are measured in feet. The x-axis r
NikAS [45]

Answer:

x=5 feet

Step-by-step explanation:

At floor level y=0

If the expression is:

0=1/3(x-5)(x+5)\\0=1/3(x^2-25)\\0=1/3x^2-25/3\\25/3=1/3x^2\\25=x^2\\x=5

But, with the negative sign, the answer is x= 5i (where i is imaginary)

3 0
3 years ago
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