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43 Cards in this Set
- Front
- Back
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1/20 --> percent?
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5%
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5% ---> fraction?
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1/20
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75% --> fraction?
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3/4
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45% --> fraction?
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9/20
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9/20 --> %?
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45%
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1/3 --> %?
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33.3333 %
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33.33333% --> fraction?
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1/3
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1/5 --> %?
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20%
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20% ---> fraction?
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1/5
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1/6 ---> %
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16.666%
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1/7 ---> %
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14.28282828%
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14.28% ---> fraction?
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1/7
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1/8 --> decimal
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.125
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.125 ---> fraction?
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1/8
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3/8 --> decimal?
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.375
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5/8---> decimal?
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.625
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.375 --> fraction?
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3/8
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.625 --> fraction?
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5/8
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median
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middle # if odd count or average of 2 middle ones if even count
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mode
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most frequent number
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how to calculate standard deviation
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1. find mean/average
2. find difference between each value and mean. 3. square each of the differences 4. Take square root of the average of the differences. |
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What is standard deviation for
0,7,8,10,10 |
35-5 = 7 is average
7 = 49 0 = 0 1 = 1 3 = 9 3 = 9 ==== Total 68 sqroot (68/5) = 3.7 standard deviation. |
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the number of ways of order A B C ?
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3 * 2 * 1 = 6 = 3!
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S = {A B C D E} the number of possible combinations of 1st,2nd
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ORDER DOES NOT MATTER, so remove duplicates!!!!
5*4 ---------- 2*1 which is really 5*4*2*1 / (2!(5-2)! |
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event A or event B
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OR ADD + (add) the probabilities
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event A and event B
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AND MULTIPLY * multiple
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(2^3)(2^2)
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2^(3+2) = 2^(5)
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(3^2)(4^2)
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(3*4)^2 = 12^2
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x^0 = ?
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1
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sum of interior angels of any polygon with N sides is
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(n-2)180
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most important triangle property
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sum of any two sides must be greater than 3rd side.
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find slope
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rise/run = y difference/x difference
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15% --> fraction
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3/20
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increased by 1/3, or 1/4, or 1/5, also means ....
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multiply by 4/3 or 5/4 or 6/5.
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multiply by 4/3, or 5/4 or 6/5 could also mean....
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increase by 1/3, 1/4, 1/5
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is x > 3y if
x=2+3y |
yes b/c x is 2 more than 37. need to be able to identiy this stuff, substitute
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x^3(1-x^2) < 0 could be rewritten as
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x^3 < 0 || (1-x^2) < 0
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x^3 < 0 || (1-x^2) < 0 could be rewritten as
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x^3(1-x^2) < 0
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n^3-n is what else....
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product of 3 consecutive integers
n3-n n(n2-1) n(n-1)(n+1) which is 4,3,5 or 3, 4, 5 |
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what is the equation for product of 3 consecutive integers
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n3-n
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if n2 is an integer, is n an integer?
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no because n could be [3] = 3^2 = 9 (integer)
or n could be [sqroot(3)] = squared is also 3. |
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If m>0 and n>0, is (m+x)/(n+x) > m/n?
(1) m < n (2) x > 0 |
answer C (both are needed)
question simplifies to m < n. (1) fact one tells you the same thing and you still don't know x value (2) you only know x value, but it helps to know the x. |
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when question (say is x < 0) matches the answer (x < 0) ....
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do not assume that's sufficient, because original question no simplified might have other variables and therefore do NOT stop. same when you think A and B are sufficient together.
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