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wolverine [178]
4 years ago
15

The average score on a standardized test is 500 points with a standard deviation of 50 points. What is the probability that a st

udent scores more than 400 on the standardized test?
Mathematics
1 answer:
aleksklad [387]4 years ago
6 0
Z = (score-mean)/SD

Calculate Z and find its proportion in table in the back of your stats book labeled "areas under normal distribution". Convert proportion to number of students.
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A school sells 712 tickets for a talent show. Adult tickets cost $8 each, and children's tickets cost $4 each. A total of $4,256
zhenek [66]

Answer:

B

x + y = 712

8x + 4y = 4,256

Step-by-step explanation:

If x=the amount of adult tickets, and y=the amount of children's tickets, then the total amount of tickets (712) should be x+y. Our first equation: x+y=712

The total made from adult tickets is found by multiplying the amount of tickets by the price per ticket: 8x. The total made from children's tickets is found by multiplying the amount of tickets by the price per ticket: 4y.The total amount of money made (4256) is the sum of the amount made by adult tickets (8x) and the amount made by children's tickets (4y). Our second equation: 8x+4y=4256

4 0
3 years ago
What is the explicit formula for this geometric sequence? 8, 4 2, 1
11Alexandr11 [23.1K]

Answer:

C

Step-by-step explanation:

The standard form for the explicit formula of a geometric sequence is given by:

a_n=a\cdot(r)^{n-1}

Where a is the initial term, r is the common ratio, and n is the nth term.

Our sequence is: 8, 4, 2, 1...

So, we can see that our initial term or a is 8.

Each subsequent term is half of the previous one. So, our common ratio is 1/2.

Let's substitute 8 for a and 1/2 for r to acquire:

a_n=8\cdot(\frac{1}{2})^{n-1}

So, our answer is C.

And we're done!

3 0
4 years ago
Write 9/20 as a decimal number
sattari [20]

Answer: 0.45

........................

5 0
2 years ago
Read 2 more answers
I am very sorry because this is off-topic but is it normal to have 840/500 points? for ranking?
hichkok12 [17]

Answer:

i think so

Step-by-step explanation:

8 0
3 years ago
If the circle radius is 27yd, how do I find the circumference without using pi?
lions [1.4K]

Circumference of a circle having radius of 27 yard can be found using the formula, π = 2(Area of Circle)/r, which is C = 169.6 yd

<h3>What is the Circumference of a Circle?</h3>
  • Circumference of a circle is the distance round the circle.
  • Circumference = Perimeter
  • Circumference of a circle without using π = 2(Area of Circle)/r.

Given:

radius of circle = 27 yd

Thus:

Area = πr² = π(27)²

Area = 2,290.2 yd²

Circumference of a circle without using π = 2(2,290.2)/27

= 169.6 yd.

Learn more about Circumference of a Circle on:

brainly.com/question/16703642

5 0
2 years ago
Read 2 more answers
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