Dissolved oxygen is used to measure water quality in lakes and streams. Three samples of water from one stream were analyzed and the following values of dissolved water reported: $6\mathrm{.}84ppm$;$6\mathrm{.}93ppm$; and $7\mathrm{.}00ppm.$

a$.$ What is the mean for these values

b$.$ What is the average deviation from the mean?

c$.$ What is the percent average deviation from the mean?