Charlie wants to order lunch for his friends hell order 6 sandwiches and a $2 kids meal for his little brother Charlie has $32 h
2 answers:
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Answer:
D. 68.00%
Step-by-step explanation:
Population mean time (μ) = 32 hours
Standard deviation (σ) = 2 hours
Assuming a normal distribution, for any given number of hours 'X', the z-score is determined by:
For X=30
For a z-score of -1, 'X' corresponds to the 15.87-th percentile of a normal distribution.
For X=34
For a z-score of 1, 'X' corresponds to the 84.13-th percentile of a normal distribution.
The percentage of the garages that take between 30 and 34 hours to erect is:
The percentage is roughly 68%.