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2 years ago

Does anyone know the answer?

Mathematics

2 answers:

Helen [10]2 years ago

5 0

The answer would be 60, if you add 13,15, and 12 up you get 40. Those numbers would be considered 2/3 of all the marbles. Divide 40 by 2 to get how many marbles is 1/3. You would get 20 being a third if the marbles. Add that to the original 40 and you’ll get a total of 60.

ddd [48]2 years ago

5 0

Answer: 60

Step-by-step explanation:

Let R be number of red marbels

Let T be Total number of marbels in bag

Now,

T = 13 + 15 + 12 + R

T = 40 + R

Now,

Let P(R) be probability of getting red marble.

P(R) = R / T

1/3 = R / ( 40 + R )

40 + R = 3R

2R = 40

R = 20

So,

T = 40 + R

T = 40 + 20

T = 60

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2 years ago

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11 months ago

Read 2 more answers

The caffeine content (in mg) was examined for a random sample of 50 cups of black coffee dispensed by a new machine. The mean an

Genrish500 [490]

Answer:

We are 98% confident interval for the mean caffeine content for cups dispensed by the machine between 107.66 and 112.34 mg .

Step-by-step explanation:

Given -

The sample size is large then we can use central limit theorem

n = 50 ,

Standard deviation $(\sigma)$ = 7.1

Mean $\overline{(y)}$ = 110

$\alpha =$ 1 - confidence interval = 1 - .98 = .02

$z_{\frac{\alpha}{2}}$ = 2.33

98% confidence interval for the mean caffeine content for cups dispensed by the machine = $\overline{(y)}\pm z_{\frac{\alpha}{2}}\frac{\sigma}\sqrt{n}$

= $110\pm z_{.01}\frac{7.1}\sqrt{50}$

= $110\pm 2.33\frac{7.1}\sqrt{50}$

First we take + sign

$110 + 2.33\frac{7.1}\sqrt{50}$ = 112.34

now we take - sign

$110 - 2.33\frac{7.1}\sqrt{50}$ = 107.66

We are 98% confident interval for the mean caffeine content for cups dispensed by the machine between 107.66 and 112.34 .

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3 years ago

Dominic runs a farm stand that sells peaches and grapes. Yesterday Dominic sold 34 pounds of peaches and 45 pounds of grapes for

scoray [572]

Answer:

34x + 45y = 192.25

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Let x stand for peaches.

Let y stand for grapes.

Since we know that yesterday he sold 35 pounds of peaches ( x ) and 45 pounds of grapes ( y ) for $192.25, we can create an equation to represent this using two variables; peaches and grapes.

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2 years ago

Evaluate the following expression 1/3^2

NISA [10]

Answer:

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Step-by-step explanation:

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3 years ago