g If annual incomes for a population are normally distributed with a mean income of $67,000 and a standard deviation of $4,200, a) What is the probability that a randomly selected student earns more than $67,000? b) What’s the probability that a randomly selected student earns between $65,000 and $70,000? c) What’s the probability that the sample average earnings of 20 people is less than $60,000?

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

a) y = -3x +2

b) y = 1/2x -6

these 2 can be combined into one equation.

-3x +2 = .5x -6

8 = 3.5x

x = 8 / 3.5 = 2.2857142857

y = -3 * (8 / 3.5) +2

y = (-24 / 3.5) + 2

y = -4.8571428571

step-by-step explanation:

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step-by-step explanation: