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3 years ago

The expected value of a random variable is the

Mathematics

1 answer:

alekssr [168]3 years ago

6 0

Answer:

The expected value of random variable X is often written as E(X) or µ or µX.

Step-by-step explanation:The expected value is the 'long-run mean' in the sense that, if as more and more values of the random variable were collected (by sampling or by repeated trials of a probability activity), the sample mean becomes closer to the expected value.

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Solve r = cs/d for c

Nady [450]

$r=\frac{cs}{d}\\\\\frac{cs}{d}=r\ \ \ \ |multiply\ both\ sides\ by\ d\\\\cs=dr\ \ \ \ \ \ |divide\ both\ sides\ by\ s\\\\\boxed{c=\frac{dr}{s}}$

6 0

3 years ago

A bag of chips weighs 228 grams. If each chip weighs 0.12 grams, how many chips are in the bag?

Gala2k [10]

Answer:

1900

Step-by-step explanation:

so lets let x represent the total chips that in the bag.

We know that each chip weight 0.12 grams, and there are 228 grams in total. ok so, 0.12x=228

Divided 0.12 to each side

0.12x/0.12=228/0.12

x=1900 chips Which means there are 1900 chips in the bag. I hope this helped you<3 sorry if it didnt:(

6 0

2 years ago

What is the experimental probability that a 10th-grade student chosen at random has at least one, but no more than two, siblings

Sophie [7]

Answer:

the experimental probability is 70%

Step-by-step explanation:

PLEASE HELP, TIMEDThe table shows the results of a survey in which 10th-grade students were asked how many siblings (brothers and/or sisters) they have.

What is the experimental probability that a 10th-grade student chosen at random has at least one, but no more than two, siblings?

To the nearest whole percent, the experimental probability is

a. 65%.

b. 70%

c. 75%

d. 80%

We are given to find

the experimental probability that a 10th-grade student chosen at random has at least one, but no more than two, siblings

we know that

probability = ( number of favourable outcomes)/ ( total possible outcomes)

a 10th-grade student chosen at random has at least one, but no more than two, siblings

so, there can be one or two siblings

so, total number of such students =18+10=28

Number of favourable outcomes =28

total number of students =4+18+10+8=40

so, total favourable outcomes =40

now, we can find probability

$p=\frac{28}{40}\\\\p=\frac{28}{40}\times 100\\\\p=70$

So,

Therefore, the experimental probability is 70%

7 0

3 years ago

1) What is the range of the data? *10 pointsXXXXXXX2 4 6 8 10 12 14 16 18181716O 15

Damm [24]

Range means highest value minus lowest value in a data collection

highest value = 18

lowest value = 2

Range = 18-2 = 16

7 0

2 years ago

In the diagram on the side, BCDE and ACF are straight lines. Calculate the values of x and y.

victus00 [196]

Answer:

y=62 degrees

x=160 degrees

Step-by-step explanation:

8 0

3 years ago