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nirvana33 [79]
2 years ago
5

How do you calculate the mean and standard deviation for a discrete random variable?

Mathematics
1 answer:
Triss [41]2 years ago
8 0

Answer:

For a discrete random variable the standard deviation is calculated by summing the product of the square of the difference between the value of the random variable and the expected value, and the associated probability of the value of the random variable, taken over all of the values of the random variable, and finally

Step-by-step explanation:

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A card is chosen at random from a deck of 52 cards. What is the probability that a king or queen is chosen?
Slav-nsk [51]

The answer is B) 2/13.

An easy way to figure this out is to find what the unsimplified probability would be:

Since there are 8 kings and queens in total, the number is:

8/52

But, since these are both even numbers, they can be simplified.

1/4 x 8 = 2

1/4 x 52 = 13

2/13

Since 13 is a prime number, the answer cannot be simplified anymore.

4 0
3 years ago
I need the answer !!!
bonufazy [111]
I'm guessing you are looking for the answer on the first question, because I cannot read the rest of the second one lol.
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4 0
2 years ago
-8w-7+2w=23 what does that equal
olya-2409 [2.1K]
W=-5 because you distribute at the beginning with the 2 variables and you solve that's equation and you will end up with 6w divided by 30 and that's will give u W=-5
7 0
3 years ago
when gail goes on a hike she always packs a ratio of 20 protien bars to 15 water bottles in her backpack . for a short hike ,gai
dimulka [17.4K]

Answer:

  4 bars

Step-by-step explanation:

Gail's ratio of bars to bottles is ...

  20 : 15 = 4 : 3

For 3 bottles, she should pack 4 bars.

8 0
3 years ago
How you would convert the repeating, nonterminating decimal to a fraction? Explain the process as you solve the problem.
bixtya [17]

Answer:

x = 0.1515...

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99 x = 15

x = 15 / 99 = 3 ∙ 5 / 3 ∙ 33 = 5 / 33

0.1515... = 5 / 33

Step-by-step explanation:

3 0
2 years ago
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