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mote1985 [20]
3 years ago
5

2. Which of the following is the equation of a circle with the radius of 1.5 and its center at (-3,2)?

Mathematics
1 answer:
Iteru [2.4K]3 years ago
8 0
(x - xo)^2 + (y - yo)^2 = r^2

[x - (-3)]^2 + [y - (2)]^2 = (1.5)^2

(x+3)^2 + (y-2)^2 = 2.25

Answer: option C

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The average Act score follows a normal distribution, with a mean of 21.1 and a standard deviation of 5.1. What is the probabilit
ohaa [14]

Answer:

0.43% probability that the mean IQ score of 50 randomly selected people will be more than 23

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 question:

\mu = 21.1, \sigma = 5.1, n = 50, s = \frac{5.1}{\sqrt{50}} = 0.7212

What is the probability that the mean IQ score of 50 randomly selected people will be more than 23

This is 1 subtracted by the pvalue of Z when X = 23. So

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

By the Central Limit Theorem

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

Z = \frac{23 - 21.1}{0.7212}

Z = 2.63

Z = 2.63 has a pvalue of 0.9957

1 - 0.9957 = 0.0043

0.43% probability that the mean IQ score of 50 randomly selected people will be more than 23

5 0
3 years ago
Items in a store are marked down by 35% what is the sale price if the regular price is $3.29
Alinara [238K]
$3.29*0.65(because you're paying 65% of the original price)
$2.14(this answer is rounded up to 2.14. if you don't round, it is 2.13)
7 0
3 years ago
A square gymnasium floor has an area of 169 m2. <br> Find the perimeter of the gymnasium floor.
Nimfa-mama [501]
Perimeter=4x=4 • 14cm =56cm
4 0
3 years ago
I need help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Lena [83]

Answer:

Go to the store or get some from friends?

Step-by-step explanation:

I honestly don't know what kind of question this is but maybe it helps?

3 0
3 years ago
The length of a rectangle is 3 more inches than the width. Find the length and width of the rectangle is the perimeter of the re
emmainna [20.7K]

Answer:

12 * 2 + x * 2 = 54

x = 15

x is 15

Step-by-step explanation:

12 * 2 + x * 2 = 54

24 + x * 2 = 54

-24              -24

x * 2 = 30

/2        /2

x = 15

7 0
3 years ago
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