Listed below are speeds (mi/h) measured from traffic on a busy highway. This simple random sample was obtained at 3:30 P. M. on a weekday. Use the sample data to construct a 95% confidence interval estimate of the population
standard deviation.
61
60
60
56
60 5359
58 59
68
58 66
Click the icon to view the table of Chi-Square critical values.
mi/h.
The confidence interval estimate is mi/h (Round to one decimal place as needed.)

Each person in an it department of 25 people works on at least one of 3 major projects: system security, program implementation, platform development. 10 people work on system security, 13 work on program implementation, and 12 work on platform development. 4 people work on system security and platform development, 5 people work on program implementation and platform development, and 2 people work on all three projects. how many people work on system security and program implementation?