G The mean federal income tax paid last year by a sample of 36 persons selected from a city was $4264 with a population standard deviation of $780. The 95% confidence interval for the mean federal income tax paid last year by all persons living in this city is:

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step-by-step explanation:

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step-by-step explanation:

a

(6r + 7) + (13 + 7r) ( remove brackets and collect like terms )

= 6r + 7 + 13 + 7r

= 13r + 20

b

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13 - r - 1 + r

= 12 - r

c

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= - 8 - r + 2r - 4

= - 12 + r

d

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= 7r - - - 6r

[-   - = - - = - ]

= r -

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step-by-step explanation: