A total of 500 married working couples were polled about their annual salaries, with the following information resulting: Husban
1 answer:
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The Area is 
and we know that 
Therefore:
and thus:
round to nearest tenth:
Therefore:
and thus:
round to nearest tenth:
Answer:
As both the mean and standard deviation are in the desired ranges, the tool passes the technical control.
Step-by-step explanation:
Mean of the batch:
The mean of the batch is the sum of all values divided by the number of items. So
Mean in the desired interval.
Standard deviation:
Square root of the sum of the difference squared between each term and the mean, divided by the number of items. So
As both the mean and standard deviation are in the desired ranges, the tool passes the technical control.