2.7 Exercise 10

Find the standard deviation for the following frequency tables using the formula. Check the calculations with the TI 83/84.

Find the standard deviation for the following frequency tables using the formula. Check the calculations with the TI 83/84.

1. Grade	Frequency
   49.5–59.5	2
   59.5–69.5	3
   69.5–79.5	8
   79.5–89.5	12
   89.5–99.5	5

2. Daily low temperature	Frequency
   49.5–59.5	53
   59.5–69.5	32
   69.5–79.5	15
   79.5–89.5	1
   89.5–99.5	0

3. Points per game	Frequency
   49.5–59.5	14
   59.5–69.5	32
   69.5–79.5	15
   79.5–89.5	23
   89.5–99.5	2