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Ivenika [448]
2 years ago
13

It is known that the normal distribution of IQ scores has the population mean of 100 and the population variance of 15. Your sam

ple has 60 people with a sample mean of 99. What is the z-score for your sample mean?
Mathematics
1 answer:
luda_lava [24]2 years ago
4 0

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Pls help im new so pls can u help me <br><br> Factorise<br> x^2+18x+80
sergejj [24]

Answer:

(x + 10)(x + 8)

Step-by-step explanation:

Given

x² + 18x + 80

Consider the factors of the constant term (+ 80) which sum to give the coefficient of the x- term (+ 18)

The factors are + 10 and + 8 , since

10 × 8 = + 80 and 10 + 8 = + 18 , then

x² + 18x + 80 = (x + 10)(x + 8) ← in factored form

5 0
3 years ago
Is the statement ""For every natural number n ≥ 1 there exists a directed graph of n vertices for which every vertex has an inde
Semenov [28]

Answer:

The given statement is false.

Step-by-step explanation:

Reason

let D be a directed graph with 'n' no of vertices and 'E' edges.

where 'n'=1.  thus D =(n,E).

In degree: in directed graph the number of incoming edges on a vertex is known as indegree.

it is denoted as deg ⁺(n).

And now we know that in a directed graph

if deg ⁻(n)= deg ⁺(n) for each vertex n.

5 0
3 years ago
A book sold 39,300 copies in its first month of release. Suppose this represents 6.3% of the number of copies sold to date. How
konstantin123 [22]
Hi there! So 39,300 copies of a book were sold on debut month of release, and that represents 6.3% of all copies sold to date. To find the total amount of copies sold, we can write and solve a proportion. Set it up like this:

39,300/x = 6.3/100

We set it up like this because 39,300 is part of the total amount, and it represents 6.3% of the total book sales. Percents are parts of 100, which is why 6.3 is above 100. Let's cross multiply the values. 39,300 * 100 is 3,930,000. 6.3 * x is 6.3x. that makes 3,930,000 = 6.3x. Divide each side by 6.3 to isolate the x. 6.3x/6.3 cancels out. 3,930,000/6.3 is 623,809.5238 or 623,810 when rounded to the nearest whole number. There. The total amount of copies sold to date is about 623,810.
8 0
3 years ago
What is a vennn diagram​
Eddi Din [679]

Answer:

a model used to compare and contrast

Step-by-step explanation:

I suggest looking at a few examples of a venn diagram to help you better understand the concept :)

Hope this helps!

-Coconut;)

4 0
3 years ago
Read 2 more answers
If p(x) = 6x³ + 5x² + 7x - 5, find the coefficient of x³​
denpristay [2]

Answer:

6x

Step-by-step explanation:

because in front of x^3 there is 6x and also the qn has asked to find the coefficient of x^3

7 0
3 years ago
Read 2 more answers
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