Question

I need help on this question, The January daily high temperatures in Rockland, Me., USA is considered the most variable in the world. A random sample of 40 January daily highs were selected from data of the last 30 years. The values ranged from a low of -19.4 °C to a high of -3°C. What class width would be useful?

Answer 1

ok the range is - 19.4 to -3

the to group in classes you might nees a class width of 1.0

-3.0 - -3.9
-4.0 - -4.9
-5.0 - - 5.9
etc
or you could increase the class width to 2 units

-3.0 - - 4.9
-5.0 - -6.9
- 7.0 = -8.9
etc

or change to a width of 5

0.0 - -4.9
- 5.0 - 9.9
- 10.0 - 14.9
-15.0 - 19.9

probably the class width of 2 may be the best.

Answer 2

follow him^