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Anna71 [15]
3 years ago
11

Can someone please help me with these 3 questions I’ll mark brainliest

Mathematics
1 answer:
pshichka [43]3 years ago
7 0

Answer:

2/ triple need video for the third answer

Step-by-step explanation:

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The student council is selling cupcakes at the school play.
Eduardwww [97]

Answer: 37.5

Step-by-step explanation:

75 divided by 2

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3 years ago
Please help it’s very cunning
gregori [183]
The answer to you question is B
7 0
3 years ago
The mean rent of a 3-bedroom apartment in Orlando is $1300. You randomly select 10 apartments around town. The rents are normall
lana [24]

Answer:

96.49% probability that the mean rent is more than $1100

Step-by-step explanation:

To solve this question, we need to understand the normal probability distribution and the central limit theorem.

Normal probability distribution

Problems of normally distributed samples are solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the zscore of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the pvalue, we get the probability that the value of the measure is greater than X.

Central Limit Theorem

The Central Limit Theorem estabilishes that, for a normally distributed random variable X, with mean \mu and standard deviation \sigma, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean \mu and standard deviation s = \frac{\sigma}{\sqrt{n}}.

For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.

In this problem, we have that:

\mu = 1300, \sigma = 350, n = 10, s = \frac{350}{\sqrt{10}} = 110.68

What is the probability that the mean rent is more than $1100?

This is 1 subtracted by the pvalue of Z when X = 1100. So

Z = \frac{X - \mu}{\sigma}

By the Central Limit Theorem

Z = \frac{X - \mu}{s}

Z = \frac{1100 - 1300}{110.68}

Z = -1.81

Z = -1.81 has a pvalue of 0.0351

1 - 0.0351 = 0.9649

96.49% probability that the mean rent is more than $1100

7 0
3 years ago
Change each phrase into an algebraic expression
maks197457 [2]

Answer:

When translating phrases into algebraic expressions, you need to identify keywords and phrases which specifically refer to a mathematical operation (addition, subtraction, multiplication, and division). Usually, you can write out the algebraic expression of the verbal description in the order that it is said

3 0
2 years ago
PLZ ANSWER QUIKCLY
Montano1993 [528]

Answer:

-36x+9

Step-by-step explanation:

\mathrm{Apply\:the\:distributive\:law}:\quad \:a\left(b-c\right)=ab-ac

=-12\cdot \:3x-\left(-12\right)\frac{3}{4}

Simplify.

7 0
2 years ago
Read 2 more answers
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