a random sample of students was taken from a university and were asked how much they spent on text books. the response in dollars are: 185 558 367 239 515 310 250 324 264 307 351 196 390 443
what is the sample mean, variance, and standard deviation?

Question

a random sample of students was taken from a university and were asked how much they spent on text books. the response in dollars are: 185 558 367 239 515 310 250 324 264 307 351 196 390 443 
 what is the sample mean, variance, and standard deviation?

amistre64 · Answer

the mean is:  add em up and divide

the variance is sort of a mean of the squared differences from the mean, but since its a sample you divide by 1 less

standard deviation is the square root of the variance

amistre64 · Answer

if you have a ti83, plug them into a list and calc a 1 var  stats on it