Homework: Practice Exam 3
Question 8, 12.3.23
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Find the standard deviation for the group of data items.
11, 11, 11, 16, 21, 21, 21
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The standard deviation is (Round to two decimal places as needed.)

(c) the diagram shows the first three shapes of a matchsticks arrangement.first shape = 3second shape = 5third shape = 7given m represents the number of matchstick used to arrange the n'th shape.(i) write a formula to represent the relation between m and n. express m as the subjectof the formula.(ii) 19 matchsticks are used to make the p'th shape. find the value of p.