Search found 308 matches

Go to advanced search

by maggiemagnet
Wed Apr 15, 2015 4:56 pm
Forum: Statistics
Topic: Normal Deviation junk
Replies: 3
Views: 119

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: 119

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: 241

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: 601

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: 928

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: 597

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: 818

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: 606

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...
by maggiemagnet
Sun Nov 02, 2014 12:18 am
Forum: Intermediate Algebra
Topic: beginner f(x) domain
Replies: 1
Views: 605

Re: beginner f(x) domain

I have f(x)= x^2 +5x +6 find the domain , all possible values of x The "domain" is all values of x that will work in the function. so f(x) = x^2 + 5x +6 factors out to (x+3) (x+2) Imy anser is x is all rational numbers except -3 or -2 Why is your function not allowed to equal zero? Dividi...
by maggiemagnet
Thu Oct 23, 2014 11:15 pm
Forum: Advanced Algebra ("pre-calculus")
Topic: degree of quotient of polynomials
Replies: 1
Views: 695

Re: degree of quotient of polynomials

1) Is it correct to assert that the degree of the quotient is always equal to the degree of the numerator minus the degree of the denominator? I've never before heard of the "degree" of a rational function but, yes, I think it would be computed the way you've described. On the other hand,...

Go to advanced search