1. A survey of 10 fast-food restaurants noted the number of calories in a mid-sized hamburger. The results are given in the table below.

513

507

503

497

495

507

457

479

464

513

Find the mean and sample standard deviation of these data. Round to the nearest hundredth.

mean ?

sample standard deviation?

2. A customer at a specialty coffee shop observed the amount of time, in minutes, that each of 20 customers spent waiting to receive an order. The results are recorded in the table below.

3.1	4.1	3.8	2.4	4.8	5.2	4.6	3.5	3.6	6.3
3.4	4.9	4.5	4.9	2.8	3.6	2.1	3.8	5.4	3.0

Find the mean and sample standard deviation of these data. Round to the nearest hundredth.

mean?

sample standard deviation?

3. Find the range, the standard deviation, and the variance for the given samples. Round non-integer results to the nearest tenth.97, 53, 66, 69, 94, 45, 80, 48, 81

range
standard deviation
variance