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160+20d

Step-by-step explanation:

B

Step-by-step explanation:

The answer is b because for 1 job, he works 20 hours by $8 per hour so it’s 160.  For the second job, he also works 20 hours but you don’t know how much your getting paid per hour so it’s replaced by d. The final answer would be “160 + 20d.”

The answer is c.) 0.6 and 0.14

Step-by-step explanation:

Given population has a size of 320.

The proportion of population = 0.6

The mean of population, p = 0.6

The mean of sample, = 0.6

Therefore  = 1 - = 1 - 0.6  = 0.4

The sample size  = 12

Therefore the standard deviation of the sample,

The mean and the standard deviation for a sample size of 12 are 0.6 and 0.14 respectively.

The answer is c.) 0.6 and 0.14