ECON 230 Workshop 3 Ch 7 - LM U E230 Workshop#3(Chap 7 Name...

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Unformatted text preview: LM U, E230 Workshop #3 (Chap. 7) \ Name: Camufm Vi”:,}g(__£ a 7.55 The amounts of electricity bills for all households in a city have a skewed probability distribution with a mean of $140 and a standard deviation of $30. Find the probability that the mean amount of electric bills for a random sample of 75 households (X) selected from this city will be a. within $6 ofthe population mean 5“ " M10 . m ’50 b. more than the population mean by at least $4 '0 , 75 C. Is the CLT needed for solving a, b? Explain briefly. .33 1‘40; (3;? 4?? an) \1q1—IHO A ¥ fl ' I, ‘173‘41 2‘1 ' 3 ”(a 1'2; lac—«r40 1 b) [‘1‘4— V10 ”Bf-1L, ? < Z 51M”) l ’ $770 L w mire-1m! 11-) C) YCS ' \QQ-C‘w 327 (W has 3t“ N21 gush 'HNA,‘ 30 Eur '\ 5&4w—‘J dif‘l" va‘V L’ 11’“ Cmfijfrul f'vffldn.‘ ...
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