Find the confidence interval specified. assume that the population is normally distributed.
the principal randomly selected six students to take an aptitude test. their scores were: 81.6 72.0 81.1 86.4 70.2 83.1 determine a 90% confidence interval for the mean score for all students.
a. 84.49 to 73.65
b. 73.65 to 84.49
c. 84.39 to 73.75
d. 73.75 to 84.39

For the 2017-2018 school year, the average costs for one year of education is:

Tuition/Fees:   $4,391

Living Costs:   $10,406

Books/Supplies:  $1,724

Transportation:  $2,313

Other Expenses:  $3,025

With the given 7% inflation rate, the average cost will increase for the next session (2018-2019).

Hence, for year 2017-2018 the total expense will be sum of all the given costs.

= $4,391 + $10,406 + $1,724 + $2,313 + $3,025

= $21,859