1050TIhelps1

Find the mean, standard deviation and draw a histogram from a frequency table
using a TI-83

Given the following data:

Numbers	Frequency
0-9	22
10-19	40
20-29	71
30-39	44
40-49	23

Enter the class midpoints (4.5, 14.5, 24.5, 34.5, 44.5) in list L1 and the frequencies in list L2.

To calculate the descriptive statistics including the mean

key: STAT CALC 1-Var Stats L1, L2 ENTER

The mean is 24.8. The standard deviation is 11.5

To display the histogram

key: 2nd STAT PLOT 1 ON Type(histogram) Xlist:L1 Freq:L2

key:ZOOM ZoomStat ENTER

or, instead of using ZoomStat,
set an appropriate calculator screen (using boundaries and class size) for a better histogram.
key:WINDOW
Xmin=-.5
Xmax=49.5
Xscl=10
Ymin=0
Ymax=80
Yscl=1
Then, key: GRAPH