Question 864078
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Hi
Calculator and/0r use of Electronic Worksheets Absolutely necessary
x	m	(x-µ)	(x-µ)^2
86	520.8	-434.80	189051.040
135	520.8	-385.80	148841.640
250	520.8	-270.80	73332.640
357	520.8	-163.80	26830.440
447	520.8	-73.80	5446.440
553	520.8	32.20	1036.840
646	520.8	125.20	15675.040
769	520.8	248.20	61603.240
830	520.8	309.20	95604.640
1135	520.8	614.20	377241.640 Sum
5208			994663.600 sum/9 = V
			110518.178 sqrt V
		SD	332.443
ME = 1.645*332.4/sqrt(10) = 173
CI: 521-173-ME < u < 521 + 173   (348, 694) not listed; B the closest match