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2 years ago

Question 1 (Essay Worth 10 points)

Mathematics

1 answer:

Svetach [21]2 years ago

8 0

Answer:

Because she is concluding that her class is an accurate representation of the overall school. The sample size in this case is too small and should increase her sample size(the amount of people surveyed) in order to get a better result.

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I will give brainliest please help me asap! Simplify the expression. Make sure you have all positive exponents.

Ipatiy [6.2K]

Step-by-step explanation:

$\frac{ {x}^{3} }{ {x}^{3} } = {x}^{3 - 3} \\ = {x}^{0} \\ = 1$

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3 years ago

a carpet store has 4 commercials every hour on a local television station how many commercials will the store have in 233 hours?

LuckyWell [14K]

Answer:

932

Step-by-step explanation:

If they have 4 every hour, and there's 233 hours, you multiply 233 by 4.

3 0

3 years ago

Find the probability of each event.

jeka57 [31]

Using the binomial distribution, it is found that there is a 0.0108 = 1.08% probability of the coin landing tails up at least nine times.

<h3>What is the binomial distribution formula?</h3>

The formula is:

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$C_{n,x} = \frac{n!}{x!(n-x)!}$

The parameters are:

x is the number of successes.

n is the number of trials.

p is the probability of a success on a single trial.

In this problem:

The coin is fair, hence p = 0.5.

The coin is tossed 10 times, hence n = 10.

The probability that is lands tails up at least nine times is given by:

$P(X \geq 9) = P(X = 9) + P(X = 10)$

In which:

$P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}$

$P(X = 9) = C_{10,9}.(0.5)^{9}.(0.5)^{1} = 0.0098$

$P(X = 10) = C_{10,10}.(0.5)^{10}.(0.5)^{0} = 0.001$

Hence:

$P(X \geq 9) = P(X = 9) + P(X = 10) = 0.0098 + 0.001 = 0.0108$

0.0108 = 1.08% probability of the coin landing tails up at least nine times.

More can be learned about the binomial distribution at brainly.com/question/24863377

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5 0

1 year ago

Rewrite each expression as a sum <br> -8x^2 + 3xy - 9x - 3

Gnesinka [82]

$-8x^2 + 3xy - 9x - 3
$

$There \ are \ no \ like \ terms.$

$No \ Solution$

3 0

3 years ago

There are three small rounds of cheddar cheese in Grace’s refrigerator.She want to bring a small wedge of cheese in her lunch fo

Snowcat [4.5K]

Answer: 1/4 round.

Step-by-step explanation:

Grace has 3 wheels of cheese and she wants to eat an equal amount each day for 12 days. So each wheel needs to last 12/3 = 4 days. So then she can eat 1 wheel/4 days = 1/4 wheel per day.

3 0

3 years ago