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Combinations |
2007-05-09 |
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From Michael:
Show that 5 X C(n,5) = n X C(n-1,4)
Answered by Stephen La Rocque. |
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Probability of getting an A |
2007-05-09 |
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From Christine:
In a class of 15 people, exactly 3 got an A. If 2
people are randomly chosen from this class, what is the probability that
at least one of these 2 got an A?
Answered by Paul Betts. |
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Area of an equilateral triangle |
2007-05-09 |
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From Diana:
how do i find the area of an equilateral triangle when they give us the base?
Answered by Penny Nom. |
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Mesure/volume |
2007-05-09 |
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From Ashley:
Calcule le volume des 2 contenants et quels est le plus grands.
Answered by Claude Tardif. |
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Is the point on a cone called a vertex? |
2007-05-09 |
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From Felicia:
Does a cone have a vertice? My teacher says that a vertice can only be
made if two or more edges join up at an angle, so what do you call a point on a cone?
Answered by Walter Whiteley. |
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Permutations, probability and standard normals |
2007-05-09 |
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From Katrina:
I have a few problems that i seem to be stuck on or can not start. Can you please help me ?
1) There are 20 people on an event planning committee. How many differnt ways can a
chairperson and assistant to the chairperson be selected?
2) An unprepared student makes random guesses for 10 true or false questions on a quiz.
Find the probability that the student passes the quiz by guessing 7 of the questions
correctly.
3) The heights of 18 year old men are normally distributed with a mean of 68 inches and
a standard deviation of 3 inches. If a random sample of 25 18-year old men is selected
what is the probability that the mean height is between 68.5 and 72 inches?
Answered by Penny Nom. |
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A committee of 4 |
2007-05-09 |
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From Danielle:
I was wondering: What is the probability that both Barb and Bob are both
on the same committee of 4 which is chosen fom their class of 10 people?
Is it 2/5? Thanks a bunch!
Answered by Penny Nom. |
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Who was the mathematician that united algebra and geometry? |
2007-05-08 |
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From Victor:
who was the mathematician that united algebra and geometry
Answered by Penny Nom. |
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Ordering fractions |
2007-05-08 |
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From Mary:
Can you place these in order? 1/8, 15/64, 15/16, 7/32
Answered by Stephen La Rocque. |
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Area and a square-based pyramid |
2007-05-08 |
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From Nick:
For a regular square pyramid with base perimeter 40 and slant height 50, what is the lateral and surface areas?
Answered by Stephen La Rocque. |
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Fractions and mixed numbers |
2007-05-08 |
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From Amanda:
I am having truble with this problem:
WRITE THE FRACTION 8/3 AS A MIXED NUMBER
Answered by Stephen La Rocque. |
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Types of variances |
2007-05-08 |
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From Latoay:
my teacher asked me to name two type of vairiance. i feel the answer is population and simple variance but i'm not sure.
thank you
Answered by Stephen La Rocque. |
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Converting from mm to cm |
2007-05-08 |
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From Amanda:
How do you convert mm into centimeters?
Answered by Gabriel Potter and Steve La Rocque. |
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Uses of pi |
2007-05-08 |
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From Kari:
How is pi used in real life?
Answered by Penny Nom. |
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The substitution method |
2007-05-08 |
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From A student:
I need help on these two problems( substitution method)
-2x+7y=10
x-3y= -3
and
6x-8y= -12
-3x+4y=9
Answered by Penny Nom. |
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