Hello all fello math students! Its Courtney here, reporting to you on this fine Thursday morning. I can't beleive tomorrow is Friday already, not to mention Friday the 13th! Look out!

Today, Mr. Bennet was in a dandy mood and gifted us with a work period, but of course there is always a catch! We have to show him what we have accomplished through out the class and what we have learned. At the beginning of class, Mr. Bennet handed out our Statistics unit project titled "Quality Control in the Manufacturing Industry". He also handed out an old statistics test for review, so we can study for the test coming up on either Wednesday or Thursday of next week.

Since I got to put down a question plus the answer, I'll give ya all a head start on the statistics review test! ;)

1. The following data represents the time spent in a doctor's waiting room in minutes.

2.5 12.5 15 3 4.5
13 16 10 6 9
10.5 11 15 5 15.5
15 20 35 11 15
6 10 25 3.5 9
8 15 20 5 7

Find the mean and standard deviation of the data. Is the data normally distributed? Justify your answer with your knowledge of the normal curve.

*Enter All in L1 in graphing calculator
Stat Calc
1 Var Stats L1

Mean= 11.8
Standard Deviation= 6.93

+-/ 1 Standard deviation = 11.8 +- 6.93= 4.87 -> 18.73

how many between?
22/30= 73%

+-/ 2 Standard deviation = 11.8 + 2 (6.93) = -2.06 -> 25.66

how many between?
all red 29/30 = 97%

[Almost follows 68, 95, 99% Rule, Some what normal.]


And there you have it! Well Im out, I gots lots of work to do! :)

Keep it Real...
Courtney