HEL I been posting questions AND NOBODY ANSWERS THEM, of u good at geometry go to my questions plsss

What is the standard deviation of the following data set rounded to the nearest tenth? 3, 17, 18, 15, 12, 21, 9

If x = -2, then x 2-7x+10 equals a. 0 b.20 c.28

An energy drink company claims that its product increases students' memory levels. to support its claims, the company issues advertisements claiming that 8 out of 10 people (chosen randomly from across the country) who tried their product reported improved memory. the missing component in this study is a .