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PtichkaEL [24]
2 years ago
11

Terry has a cube numbered from 1 to 6. He tosses the cube onto the floor 120 times. How many times should he expect it to land o

n a 2 or 3?
Mathematics
1 answer:
Temka [501]2 years ago
7 0

The expected value of a dataset is the mean or average of the dataset.

The cube is expected to land on a 2 or 3 a total of 40 times

The cube is said to be numbered from 1 to 6.

This means that, the probability of getting each number is 1/6.

So, the probability that the outcome is 2 or 3 is:

P(2\ or\ 3) = P(2) + P(3)

This gives

P(2\ or\ 3) = \frac 16 + \frac 16

Add fractions

P(2\ or\ 3) = \frac {1+1}6

P(2\ or\ 3) = \frac 26

Simplify

P(2\ or\ 3) = \frac 13

The number of rolls (n) is 120.

So, the expected value is:

E(x) = np

This gives

E(x) = 120 \times \frac 13

E(x) = 40

Hence, the cube is expected to land on a 2 or 3 a total of 40 times

Read more about expected values at:

brainly.com/question/13005177

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So, 30 is the perimeter. We are told the table is twice as long as it is wide.

So, we have think of 2 numbers, one being twice as big than the other. So, it is a rectangle The two number represents the length and the width. To find the perimeter we add all the lengths and the widths. Since the pool table is a rectangle we have two lengths and two widths.

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the tow numbers be 10 and 5. 5 is half of 10 and, when multiplied by 2 it is 10. So just to make sure the numbers 5 and 10 work out lets do a calculation.

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