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3 years ago

Please help me with the question. I need help with the top question not the bottom

Mathematics

1 answer:

Schach [20]3 years ago

3 0

Yes-this is because you can start from the 7th part and then go backwards to forwards to find the letter/number/pattern you need

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Suppose your statistics instructor gave six examinations during the semester. You received the following grades (percent correct

zheka24 [161]

Answer:

15 samples

Step-by-step explanation:

The total sample space consists of 6 items

{79,64,84,82,92,77}

So,

n=6

The instructor has to randomly select 2 test scores out of 6.

So, r=6

The arrangement of scores selection doesn't matter so combinations will be used.

$C(n,r)=\frac{n!}{r!(n-r)!} \\C(6,2)=\frac{6!}{2!(6-2)!}\\=\frac{6!}{2!*4!}\\=\frac{6*5*4!}{2!*4!} \\=\frac{30}{2}\\=15\ ways$

Therefore, there are 15 different samples are possible without replacement ..

7 0

3 years ago

An elevator is two floors below ground level and goes

SVEN [57.7K]

Answer:

Third floor

Step-by-step explanation:

The ground level is zero, then we have the following equations.

<u>2 levels below ground level:</u>

0 - 2 = -2

<u>5 levels up:</u>

-2 + 5 = 3

4 0

3 years ago

Read 2 more answers

Help with number 4,5,6 and 7 plz help this is really hard I fell asleep in class plz plz help

Katen [24]

4. 6/8, 5. 3 5/8, 6. 7 7/8, 7. 72 months and 2,190 days

8 0

4 years ago

Read 2 more answers

A newspaper carrier has $1.80 in change. He has two more quarters than dimes but three times as many nickels as quarters. How ma

Mazyrski [523]

$1\ quarter=\$0.25\\1\ dime=\$0.10\\1\ nickel=\$0.05\\\\q\ \ \ \rightarrow\ \ \ the\ number\ of\ the\ quarters\\d\ \ \ \rightarrow\ \ \ the\ number\ of\ the\ dimes\\n\ \ \ \rightarrow\ \ \ the\ number\ of\ the\ nickels\\\\q=2d\ \ \ and\ \ \ n=3q\ \ \ \Rightarrow\ \ \ n=3\cdot 2d=6d\\\\q\cdot0.25+d\cdot0.10+n\cdot 0.03=1.80\\\\2d\cdot0.25+d\cdot0.1+6d\cdot0.05=1.8\\\\$

$0.5d+0.1d+0.3d=1.8\\\\0.9d=1.8\ \ \ \Rightarrow\ \ \ d=2\ \ \ \Rightarrow\ \ \ q=2\cdot2=4\ \ \ and\ \ \ n=6\cdot2=12\\\\Ans.\ 4\ quarters,\ 2\ dimes,\ 12\ nickels$

3 0

3 years ago

Please help me it will be helpful

morpeh [17]

Answer:

30 ways, 5 x 3 x 2 = 30

6 0

4 years ago