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3 years ago

1. What is the probability of getting a red marble out of a bag when there are 4 red

Mathematics

2 answers:

forsale [732]3 years ago

5 0

Answer:

1/3

Step-by-step explanation:

The total number of marbles is

4red+ 3 green + 5 blue = 12 marbles

P(red) = number of red/ total

= 4/12

=1/3

Vesna [10]3 years ago

5 0

Answer:

4 + 3 + 5 = 12

3/12

1/4

Step-by-step explanation:

the probability of getting red is dividing the number of red marbles by the total number of marbles.

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Weight of a rock: In a geology course, students are learning to use a balance scale to accurately weigh rocks. One student plans

statuscvo [17]

Answer:

The student who weighted the rock 5 times has a 95% confidence interval of (25.2, 29.1) which is guaranteed to be more wider (less precise) than the other student who weighted the rock 20 times.

Step-by-step explanation:

What is Confidence Interval?

The confidence interval represents an interval that we can guarantee that the target variable will be within this interval for a given confidence level.

The confidence interval is given by

$CI = \bar{x} + t_{\alpha/2}(\frac{\sigma}{\sqrt{n} } ) \\$

Where $\bar{x}$ is the mean weight $\sigma$ is the standard deviation $t_{\alpha/2}$ is the critical value from t-table and n is the sample size.

The term $t_{\alpha/2}(\frac{\sigma}{\sqrt{n} } )$ is known as margin of error.

As the sample size is decreased the corresponding margin of error increases which results in wider confidence interval which means smaller precision.

The student who weighted the rock 5 times has a 95% confidence interval of (25.2, 29.1) which is guaranteed to be more wider (less precise) than the other student who weighted the rock 20 times.

We can say with 95% confidence that the true mean weight of the rock is within the interval of (25.2, 29.1).

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3 years ago

A pair of dice are rolled. What is the probability of getting a sum less than 8?

IRISSAK [1]

A regular dice ???????????

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3 years ago

Two numbers that add to -0.5 and multiply to 1

snow_lady [41]

X +(1/x) = -0.5 has no real solutions.

There are no real numbers that meet your requirements.

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-1/4 +i√(15/16), -1/4 -i√(15/16)

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3 years ago

The coordinates of the vertices of the triangle shown below are a(2,13), b(10,5) c(12,14).

Luden [163]

(2,13)is the right answer

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3 years ago

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Elza [17]

Answer:

21.80