The following data represent the annual number of days over 100*F in a city from 195 to 2004



The following data represent the annual number of days over 100*F in a city from 195 to 2004. Approximate the mean and standard deviation of annual number of days over 100*F. Treat the data as a population.
# of over 100*F days
0-9
10-19
20-29
30-39
40-49
50-59
60-69
# of years
32
35
17
10
3
2
1