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3 years ago

Would it be 1/5 ?? i'm not sure how to do probability

Mathematics

1 answer:

Sidana [21]3 years ago

8 0

Answer:

Choice A

Step-by-step explanation:

5 red socks, 2 white socks, 3 blue socks = 10 socks

1 st sock red : 5 / 10

2nd sock red : 4/9

we didn't put the sock back

a pair of red socks

5/10 * 4/9 = 20/90 = 2/9

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Which is the graph of f(x)=4(1/2)x

NemiM [27]

Answer:

here's the graph

Step-by-step explanation:

5 0

3 years ago

On a certain hot summer's day, 643 people used the public swimming pool. The daily prices are $1.50 for children and $2.00 for

lilavasa [31]

249 children and 394 adults swam at the public pool.

Step-by-step explanation:

Number of people swam at pool = 643

Receipts = $1161.50

Cost for one child = $1.50

Cost for one adult = $2.00

Let,

x be the number of children

y be the number of adults

According to given statement;

x+y=643 Eqn 1

1.50x+2.00y = 1161.50 Eqn 2

Multiplying Eqn 1 by 2

$2(x+y=643)\\2x+2y=1286\ \ \ Eqn\ 3\\$

Subtracting Eqn 2 from Eqn 3

$(2x+2y)-(1.50x+2.00y)=1286-1161.50\\2x+2y-1.50x-2.00y=124.50\\0.5x=124.50$

Dividing both sides by 0.5

$\frac{0.5x}{0.5}=\frac{124.50}{0.5}\\x=249$

Putting x=249 in Eqn 1

$249+y=643\\y=643-249\\y=394$

249 children and 394 adults swam at the public pool.

Keywords: linear equation, subtraction

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4 0

3 years ago

He ran 10 meters in 2.7 seconds. Priya ran 10 meters in 2.4 seconds. who ran faster?

Stels [109]

Answer:

Priya

Step-by-step explanation:

5 0

2 years ago

Read 2 more answers

Consider the equation a(3 - x) = - 2x + b. What values of a and b make the solution of the equation x =-2? Write a number from t

-Dominant- [34]

Answer:

a=1, b=1

Step-by-step explanation:

Given the equation: $a(3 - x) = - 2x + b$

If the solution of the equation $x=-2$

Then to find the values of a and b, we substitute $x=-2$ into the equation.

$a(3 - x) = - 2x + b\\a(3 - (-2)) = - 2(-2) + b\\a(3+2)=4+b\\5a=4+b\\5a-b=4\\$If we make the substitution a=1, b=1 into the above equation\\5(1)-1=4 is true.\\Therefore: a=1, b=1$

6 0

3 years ago

Random samples of size 49 are taken from a population that has 200 elements, a mean of 180, and a variance of 196. the distribut

OleMash [197]

Answer:

The mean is 180.

The standard error is 0.286.

Step-by-step explanation:

This question can be solved using the central limit theorem.

The Central Limit Theorem estabilishes that, for a random variable X, with mean $\mu$ and standard deviation $\sigma$ , a large sample size can be approximated to a normal distribution with mean $\mu$ and standard deviation $\frac{\sigma}{\sqrt{n}}$ .

In this problem, we have that:

The mean of the distribution of the sample means is the same as the mean of the population. This means that the mean is 180.

The standard deviation of the population is the square root of the population variance. So $\sigma = \sqrt{196} = 14$ .

The standard deviation of the sampling distribution of the sample mean is $s = \frac{\sigma}{\sqrt{n}} = \frac{14}{\sqrt{49}} = 2$ .

The standard error of the sampling distribution of the sample mean is $SE = \frac{s}{\sqrt{n}} = \frac{2}{7} = 0.286$

5 0

3 years ago