Answer:
The sales mix is 1:2.
Model 101 Model 102
Selling Price 21 56
Variable Cost -14 -35
Contribution Per Unit 7 21
Multiply Sales Mix Ratio 1 2
Weighted Contribution 7 42
Now add the weighted Contribution to compute Contribution margin per composite unit which is 7+42=$49
Explanation:
I assumed that the cost and selling price here for Model 101 is $14 and $21 respectively. Similarly the cost and selling price of Model 102 is $35 and $56 respectively.
Remember that Contribution margin per composite unit means that we will earn 49 dollars(combined contribution of sales mix) if we sell the sale mix of Model 101 and 102 which is 1:2.
The first would would be $5,500 and then the last space would be $5,250
Answer:
Option D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $151 and $216.
Explanation:
A confidence interval is a range of values, derived from the sample statistics, which may include the value of an unknown population parameter.
A 95% confidence interval indicates that between 152 of 160 samples (95%) of the same population will produce confidence intervals that will contain the population parameter.
It also means that we have a 95% confidence that the average (average amount) is among the resulting amounts obtained.
Logically, option "D" is missing the final part. This would be: D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $ 15.
This is the only true option, since the test is based on a sample of only 160 households, the entire population of households cannot be included.
Hence, the correct option is:
Option D. We are 95% confident that the mean amount spent on electric service among the 160 households is between $151 and $216.
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