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by maggiemagnet
Tue May 19, 2015 5:47 pm
Forum: Discrete Math
Topic: Probability Question
Replies: 1
Views: 20

Re: Probability Question

...9% of men are color blind. For four randomly selected men, find the probability that a. the first three are not color blind and the fourth is color blind? For any random guy, what is the probability that he's color-blind? What is the probability that he is not color-blind? Does one random guy's ...
by maggiemagnet
Sun May 17, 2015 12:48 am
Forum: Intermediate Algebra
Topic: How to reduce this rational expression to its lowest term?
Replies: 2
Views: 33

Re: How to reduce this rational expression to its lowest term?

\dfrac{a^3\, -\, b^3}{a\, -\, b} The answer is suppose to be a^2\, +\, ab\, +\, b^2 I've tried to factor a^3\, -\, b^3 but it still didn't lead up to the answer. What steps are required here? Apply the formula for factoring differences of cubes . That, or do the long polynomial division . :clap:
by maggiemagnet
Wed Apr 15, 2015 4:56 pm
Forum: Statistics
Topic: Normal Deviation junk
Replies: 3
Views: 227

Re: Normal Deviation junk

80 is two deviations from the mean. How do I find out the percentage when no other info is given? I'm sorry; I'd assumed that your class had covered normal distributions already. To learn about percentages related to deviations, try here or here . After you've studied the two lessons, paying close ...
by maggiemagnet
Sun Apr 12, 2015 2:14 am
Forum: Statistics
Topic: Normal Deviation junk
Replies: 3
Views: 227

Re: Normal Deviation junk

A normal distribution has a mean of 100 and a standard deviation of 10. Find the probability that a value selected at random is in the given interval: from 80 to 100 How in the world am I suppose to draw one if I don't have the info? There is nothing in the instructions about drawing a picture. Ins...
by maggiemagnet
Mon Mar 30, 2015 5:23 pm
Forum: Beginning Algebra
Topic: Linear independence & linear dependence
Replies: 1
Views: 337

Re: Linear independence & linear dependence

Suppose that vectors v1,v2,v3 are linearly independent. (i) Prove that v1-v2, v2-v3 and v3-v1 are linearly dependent. (ii) Prove that v1+v2, v2+v3 and v3+v1 are linearly dependent. I need you guys to help me solve this question.... To learn how to show linear dependence try here . Then set things u...
by maggiemagnet
Fri Jan 16, 2015 3:18 pm
Forum: Trigonometry
Topic: angles of a oblique triange
Replies: 4
Views: 696

Re: angles of a oblique triange

I think the usual way of saying it would like something like this:

"ABC is a triangle. Opposite the vertices A, B, and C are the sides a, b, and c, respectively. The lengths of the sides are: a = 88, b = 72, and c = 110. Find the measures of the angles at A and at C."
:clap:
by maggiemagnet
Fri Jan 16, 2015 3:14 pm
Forum: Beginning Algebra
Topic: Domain and Range of a relation
Replies: 5
Views: 1086

Re: Domain and Range of a relation

Then which is the independent variable and which is the dependent variable? The domain and range depend on this information! Thanks!
:clap:
by maggiemagnet
Thu Jan 15, 2015 12:27 pm
Forum: Intermediate Algebra
Topic: Pondering Base and Exponent, Both NEGATIVE
Replies: 3
Views: 687

Re: Pondering Base and Exponent, Both NEGATIVE

I wrote up a problem for myself to test the behavior of a negative exponent with a negative base.... y\, =\, \dfrac{(-5)^{-x}}{34} Before I proceed, I will do a mini-proof of the numerator. (-5)^{-x}\, =\, \dfrac{x}{(-5)^1}\, =\, \dfrac{x}{(-5)} Is this math correct?...
by maggiemagnet
Sat Nov 22, 2014 2:03 pm
Forum: Statistics
Topic: I need help to solve this question
Replies: 1
Views: 876

Re: I need help to solve this question

The following table represents the absent days of a sample of students in the statistics course Absent days 0 1 2 3 4 Number of students 10 5 8 Y 3 Determine the value of Y if the median of the absent days is 1.5 day. The " median " is the middle value in the list. So write out the list: ...
by maggiemagnet
Mon Nov 10, 2014 6:29 pm
Forum: Statistics
Topic: Expected Value of Probability Density Function
Replies: 1
Views: 667

Re: Expected Value of Probability Density Function

I am trying to find the Expected Value of the following Probability Density Functions (where E is Euler's number) for the x values shown below. For some reason I get very different values from my calculations of the expected value when applying the discrete and continuous method of calculating expe...

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