The following are the scores in Math of the samples 15 Grade 10 students. 60,61,58,70,62,74
75,78,80,68,85,86
80,65,70
Compute the following:
a. Sample mean
b. Sample variance
c. Sample standard deviation​

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.