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tamaranim1 [39]
3 years ago
6

the following data values represent a sample. what is the variance of the sample? x=9. use the information in the table to help

you
Mathematics
1 answer:
KiRa [710]3 years ago
3 0

Answer:

Step-by-step explanation:

Variance of X = 9

Regression equations are

(*) 8x −10y + 66 = 0

(**) 40x −18y − 214 = 0

Find out the following missing results.

(i) The means of X and Y

(ii) The coefficient of correlation between x and y

(iii) The standard deviation of Y

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Which expression is equivalent to this expression?
olga nikolaevna [1]

Answer:

the answer is d

Step-by-step explanation:

5 0
3 years ago
Find the solution of the given initial value problem in explicit form. y' = (1 – 11x)y?, y(0) = -1 Enclose numerators and denomi
Tanya [424]

Answer:

y(x)=-e^{x-(\frac{11*x^{2} }{2}) }

Step-by-step explanation:

This is a separable equation. First divide both sides by y:

\frac{dy(x)}{\frac{dx}{y(x)} } =-11x+1\\\frac{dy}{y}=(-11x+1)dx

Integrate both sides:

\int\ \frac{dy}{y} \ =\int\ (-11x+1) \, dx

log(y)=-(\frac{11*x}{2} )+x+ c_1

Solve for y taking exp to both sides:

y(x)=c_1*e^{x-(\frac{11*x^{2} }{2}) }

Where c_1 is an arbitrary constant

Evaluating the initial condition:

y(0)=c_1*e^{0-(\frac{11*0^{2} }{2}) } =-1

c_1*e^{0} =-1\\c_1*1=-1\\c_1=-1

Finally, replacing c_1 in the differential equation solution:

y(x)=-e^{x-(\frac{11*x^{2} }{2}) }

8 0
3 years ago
A card game is being played and the 7 of clubs, 9 of hearts, 10 of spades, and
Luba_88 [7]

Answer:

Step-by-step explanation:

Only j,q,k beat 10 and there are four each of them so there are 12 cards that will beat the ten. 4 cards have already been drawn so there are 52-4=48 cards left in the deck, so the probability of beating the 10s is

12/48

1/4

Which is 25%

7 0
3 years ago
8.517 write this number in two forms
Ghella [55]
There is a fraction form and decimal form. The decimal form would be the same: 8.517, but the fraction form will be 8517/1000 since the 7 ends on the 1000's place, so you can remove the decimal and put it over 1000.

Decimal form: 8.517
Fraction form: 8517/1000

Also another fraction form is having mixed numbers: 8 \frac{517}{1000}
3 0
4 years ago
Given that the length an athlete throws a hammer is a normal random variable with mean 50 feet and standard deviation 5 feet, wh
raketka [301]

Answer:

P(X>55)=0.16

Step-by-step explanation:

We want to find the probability that an athlete throws the hammer no less than 55 feet given that the length an athlete throws a hammer is a normal random variable with mean 50 feet and standard deviation 5 feet.

We know that 55 is 1 stand deviation above the mean which is 50.

By the empirical rule, 68% of the distribution is within 1 standard deviation of the mean.

In this case only one standard deviation above the mean will give 34% .

So the probability that he throws the hammer less than 55 feet is 0.5+0.34=0.84

The probability that he throws it no less than 55 feet is 1-0.84=0.16

3 0
3 years ago
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