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I assume that the length of the rectangle is 8 inch more than width .
Answer: 95% of all people work between 7 hours and 9 hours per day and It is true.
Step-by-step explanation:
Since we have given that
Mean = 8 hours
Standard deviation = 0.5 hours
According to Empirical Rule,
at 95% confidence, it lies within 2 standard deviations from the mean
so, lower value is given by
upper value is given by
Hence, 95% of all people work between 7 hours and 9 hours per day.
Therefore , it is true.