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Len [333]
3 years ago
12

Identify which statement about the mean of a discrete random variable is not true or state that they are all true.Choose the cor

rect answer below.A.The mean can be interpreted as the average outcome if the experiment is repeated many times.B.The mean must be a possible value of the random variable.C.The mean can be found using the formula Summation from nothing to nothing x times Upper P (x ).D.All of these statements are true.
Mathematics
1 answer:
pashok25 [27]3 years ago
4 0

Answer:

A, C are true .  B is not true.

Step-by-step explanation:

Mean of a discrete random variable can be interpreted as the average outcome if the experiment is repeated many times. Expected value or average of the distribution is analogous to mean of the distribution.

The mean can be found using summation from nothing to nothing x times Upper P (x) , i.e ∑x•P(x).

Example : If two outcomes 100 & 50 occur with probabilities 0.5 each. Expected value (Average) (Mean) : ∑x•P(x) = (0.5)(100) + (0.5)(50) = 50 + 25 = 75

The mean may not be a possible value of the random variable.

Example : Mean of possible no.s on a die = ( 1 + 2 + 3 + 4 + 5 + 6 ) / 6 = 21/6 = 3.5, which is not a possible value of the random variable 'no. on a die'

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Answer: 31311620

Step-by-step explanation: Calculator

5 0
2 years ago
Is 3x^2-5x^4+2x-12 a polynomial
ivanzaharov [21]

Yes it is a polynomial .

The degree of polynomial is 4 and there is no power as a fraction or negative integer

6 0
3 years ago
On the first visit to the veterinarian's office, Cora's kitten weighed 550 grams. On the second visit, the kitten had gained 350
STALIN [3.7K]

Answer:

Step-by-step explanation:

total increase=350+300=650

percentage~increase=\frac{650}{550} *100\\\approx 118.18 %%

7 0
3 years ago
39. Rewrite each expression as an equivalent expression containing only one logarithm.
monitta

Answer:

ln{\frac{(p+q)^3}{q^2p^7} }

Step-by-step explanation:

3 ln(p + q) − 2 ln(q) − 7 ln(p)

=ln(p+q)^3- ln(q)^2-ln(p)^7

= ln(p+q)^3-{ln(q)^2+ln(p)^7}

=ln(p+q)^3-ln(q)^2*(p)^7

=ln{ (p+q)^3÷(q)^2*(p)^7}

=ln{\frac{(p+q)^3}{q^2p^7} }

3 0
3 years ago
3x+10y=13<br> 4(-2y+x)-9x=13
mart [117]

Answer:

x=-9

y=4

Step-by-step explanation:

3x+10y=13 ← Equation 1

4(-2y+x)-9x=13\\

By simplifying the above equation we get,

-8y+=4x-9x=13 (Simplifying the brackets)

-8y-5x=13 (By subtracting -9x from +4x) ← Equation 2

Multiply Equation 1 by 5 and Equation 2 by 3 and add them together.

Equation 1 multiplied by 5 will give,

15x+50y=65

Equation 2 multiplied by 3 will give,

-24y-15x=39

Add those together,

15x+50y-24y-15x=65+39

26y=104 (After simplifying x values)

Therefor y=4

By substituting y=4 to Equation 1 we get,

3x+10*4=133x+40=13\\3x=-27\\x=-9

Therefor we can say,

x=-9

y=4

8 0
3 years ago
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