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OleMash [197]
3 years ago
12

Brainliest!!

Mathematics
1 answer:
Andreyy893 years ago
6 0

answer of all tasks ( 1 to 6) is attached below in 4 images

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Select True or False from each pull-down menu, depending on whether the corresponding statement is true or false.
Schach [20]

Answer:

1) FALSE

2) FALSE

3) TRUE

4) TRUE

Step-by-step explanation:

Previous concepts

Normal distribution, is a "probability distribution that is symmetric about the mean, showing that data near the mean are more frequent in occurrence than data far from the mean".

The Z-score is "a numerical measurement used in statistics of a value's relationship to the mean (average) of a group of values, measured in terms of standard deviations from the mean".  

Part 1

The mean and standard deviation of a normally distributed random variable which has been standardized are one and zero, respectively.

The mean and the deviation for  the normal standard distribution are:

\mu=0, \sigma =1

So then that's FALSE.

Part 2

Using the standard normal curve, the z−score representing the 10th percentile is 1.28.

We are looking for a value a, that satisfy this:

P(X>a)=0.90   (a)

P(X   (b)  

We can find a z value that satisfy the condition with 0.10 of the area on the left and 0.90 of the area on the right it's z=-1.28. On this case P(Z<-1.28)=0.10 and P(Z>-1.28)=0.90

So that's FALSE.

Part 3

Let z1 be a z−score that is unknown but identifiable by position and area. If the symmetrical area between −z1 and +z1 is 0.9544, the value of z1 is 2.0

If we find this probability:

P(-2.0< Z

So on this case we can approximate to 0.9544. And that's TRUE.

Part 4

Using the standard normal curve, the z−score representing the 75th percentile is 0.67.

We are looking for a value a, that satisfy this:

P(X>a)=0.25   (a)

P(X   (b)  

We can find a z value that satisfy the condition with 0.75 of the area on the left and 0.25 of the area on the right it's z=0.67. On this case P(Z<0.67)=0.75 and P(Z>0.67)=0.25

So that's TRUE.

3 0
3 years ago
I WILL MAKE BRAINLEST!!!!!!
frozen [14]

Answer:

\sqrt{\frac{9}{4}} < \frac{5}{3} < \sqrt{5} < 2.5

Step-by-step explanation:

Given the following numbers, \sqrt{\frac{9}{4}}, \sqrt{5}, 2.5, and, \frac{5}{3}, let's express each as whole or decimal numbers, to find out the least to the greatest.

\sqrt{\frac{9}{4}} = \frac{\sqrt{9}}{\sqrt{4}}

\frac{3}{2} = 1.5

\sqrt{5} ≈ 2.2

2.5 (already in decimal form)

\frac{5}{3} ≈ 1.7

From the least to the greatest, we have:

\sqrt{\frac{9}{4}} < \frac{5}{3} < \sqrt{5} < 2.5

3 0
3 years ago
I need help on. this one pliss​
Fofino [41]
It’s 55, plug in the numbers and the equation is 5(3)^2 + 4(2.5) then
5(9)+10 lastly
45+10=55
6 0
2 years ago
Read 2 more answers
What is the value of the equation -2/3x + 9 = 4/3 x -3?​
MArishka [77]

Answer:

x = 6

Step-by-step explanation:

\frac{-2}{3}x+9=\frac{4}{3}x-3\\\\\frac{-2}{3}x-\frac{4}{3}=-3-9\\\\\frac{-2-4}{3}x= - 12\\\\\frac{-6}{3}x = -12\\\\ -2x  -12\\\\x = \frac{-12}{-2}\\\\x = 6

3 0
2 years ago
The ratios of boys to girls on a soccer league is 2:5. If there are 28 boys, how many girls are playing soccer? EXTRA POINTS! WI
Leviafan [203]
If it’s 2:5 then there should be 70 girls!
4 0
3 years ago
Read 2 more answers
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