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2 years ago

Please help! i will give you a lot of points if you do!

Mathematics

1 answer:

algol [13]2 years ago

5 0

Answer:

Khan Academy.

Step-by-step explanation:

You can go on khan academy and search up "percentages and numbers." The videos should immediately pop up. there are also lessons if you don't want to risk getting your problem wrong. If you are still confused and do not understand please just comment and I will respond.

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Can some one pls help

azamat

Answer:

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6 0

3 years ago

One watershed can encompass another watershed. true or false

Eva8 [605]

Answer:

True

Step-by-step explanation:

4 0

3 years ago

A Finance professor created a multiple-choice examination with 100 questions for his students. Each question has five possible

seropon [69]

Answer:

a. 0.011 or 1.1%

b. 31.56% or 0.3156

c. 99.94% or 0.9994

d. 3.42% or 0.0342

Step-by-step explanation:

Given

Number of multiple choice questions = 100

Probability of success for students who have attended lectures and done their homework = 0.85

a. Using binomial distribution

Probability of correctly answering 90 or more questions out of 100

$= \sum^{100}_{x=90}\left {100} \atop {x}} \right C (0.85)^x(0.15)^{100-x}\\=0.011$

Since,

In Binomial Distribution

$P(X=x) =\left {h} \atop {x}} \right.C P^x q^{n-x}$

where $x=0,1,...,n$

and $q=1-P$

Probability is therefore 1.1% or 0.011

b. Probability of correctly answering 77 to 83 questions out of 100

$= \sum^{83}_{x=77}\left {100} \atop {x}} \right C (0.85)^x(0.15)^{100-x}\\=0.3156$

The probability is therefore 31.56% or 0.3156

c. Probability of correctly answering more than 73 questions out of 100

$= \sum^{100}_{x=73}\left {100} \atop {73}} \right C (0.85)^x(0.15)^{100-x}\\=0.9994$

The probability is therefore 99.94% or 0.9994

d. Assuming that the student has answered randomly

Probability of success = 1/5 = 0.2

Probability of failure = 1 - 0.2 = 0.8

Probability of answering 28 or more questions correctly

$= \sum^{100}_{x=28}\left {100} \atop {x}} \right.c (0.2)^x(0.8)^{100-x}\\=0.0342$

The probability is therefore 3.42%

5 0

3 years ago

Help please !

Elodia [21]

Okay so for number one you use PEMDAS so you can either divide 144 by 12 first or multiply 5 and 6 or divide 6 by 3.
Normally, I do multiplicarion first so the first step would be to multiply 5 and 6 with is 30 so the new equation is 144/12+30/3 okay and then do the divisions.
So the new equation would be 12+10 and which equals 22

And for number two since you have a variable you can't use PEMDAS so just distribute the 11 but only to the ones in the parentheses.
So the new equation turns out to be 11x-33+5=0
Okay then, since you need to figure out what x is, you move over -33 and 5 by adding 33 and subtracting 5 which gives you 11x=33-5
And then just solve 11x=28 and x is a decimal number. (x=2.55)

6 0

3 years ago

Between 10 pm and 7:45 am the water level in a swimming pool decreased by 13/16 inch. Assuming the constant rate how much did it

dsp73

The answer to your question is, The pool dropped 1.38/16 inches per hour.

6 0

3 years ago