A group of high school students is surveyed about their heurs spent on studying math. Asked about how mary hours they spenet studying math in the previour week, the stadents mosonded as folows 4 , 2 , 0.2.3 , 0.7.5.3 Assume it is a Sarpile of the population of calculate uning N-1. What is the standard deviation of this data set? 210 4.9. 221 4.41.