Plz slove Q36 to 43 plz slove all question

Plz slove Q36 to 43 plz slove all question 29 42. a 20 •re 20 and %

Dear Student,
Question 41)           Arithmetic mean and standard deviation
 

variable	frequency	x	xf	$x-\overline{x}$	$(x-\overline{x}{)}^2$	$(x-\overline{x}{)}^2$f
5-10	2	7.5	15	-13.55	183.6	367.2
10-15	9	12.5	112.5	-8.55	73.10	657.9
15-20	29	17.5	507.5	-3.55	12.6	365.4
20-25	54	22.5	1215	1.45	2.10	113.4
25-30	11	27.5	302.5	6.45	41.6	457.6
30-35	5	32.5	162.5	11.45	131.10	655.5
TOTAL	110		2315			2617

Arithmetic mean = $\overline{x}$ = total of fx/ total of f
                                    2315/110
                                 = 21.08
standard deviation =
$$\begin{gathered} \frac{\sqrt{f(x-\overline{x{)}^2}}}{\sqrt{f}} \\ = \sqrt{\frac{{\displaystyle 2617}}{110}} \\ =\sqrt{23.79} \\ =4.88 \end{gathered}$$

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