A search on Best Barryo Mobile's website for "smartwatch" produced ninety-two results, 40 of which are actual smartwatches. Their prices are summarized in the frequency table below:

Price ($)	Number of Watches
50 to under 100	4
100 to under 150	6
150 to under 200	8
200 to under 250	5
250 to under 300	10
300 to under 350	7

a. Calculate an approximate value for the sample variance.

s2=s2=

Round to two decimal places if necessary

b. Calculate an approximate value for the sample standard deviation.

s=s=

Round to two decimal places if necessary