Ms. Yang's Math Page

In the following video he calculates the ‘k’ from vertex (h,k) by plugging in the value of h into the original quadratic function. You can also use k = c-(b^2)/(4a). Both yield the same ‘k’ value.

These questions take a long time so watch as many of the following videos until you understand them.

For a complete lesson:

https://www.youtube.com/watch?v=rfs81HVsjn0

https://www.youtube.com/watch?v=ND-sR642LF0

TIPS:

EXAMPLES:

1A  2B  3A  4D  5B  6C  7D  8C  9C  10D
11) 68.3 %
12) 66.9%
13) -1. Mean is 1 less than the median.
14) 95
15) 3/2 = 1.5
16) 46
17) 1.44
18) 57.648< µ < 62.352
19) 226
20a) $1182.10 < µ < $1223.90
20b) increase sample size n, or decrease confidence level
21) 97.7%
22) No, it doesn’t follow a bell-shaped curve, but more of a lop-sided curve.
23a) µ = 79.4, σ = 8.4
b) 24
c) 66.7%
d) 36 (all scores)
e) 100%

Definition:
https://www.youtube.com/watch?v=Q6Lj_8yt4Qk

Normal Distribution:

Standard Normal Distribution: FYI He says “moo” for “mu” which I pronounce as “mew” in class.

How to Read Z-scores from the table:

https://www.youtube.com/watch?v=xHcxq8JMLJQ

https://www.youtube.com/watch?v=FuZ-dgnpQaY

https://www.youtube.com/watch?v=3gOYis7K-Q4

https://www.youtube.com/watch?v=ZCJhXrqaA88