Question

the average healing time of a certain type of incison is 240 hours, with standard dev of 25

finite

The average healing time of a certain type of incision is 240 hours, with standard deviation of 25 hours. What percentage of the people having this incision would heal in 8 days or less? Assume a normal distribution Click the icon to view the area under the standard normal curve table % of people having this incision should heal in 8 days or less. (Type an integer or decimal rounded to the nearest hundredth as needed.)

Answer 1

µ =    240      
σ =    25      
X = 24* 8 = 192 hours
P( X ≤    192   ) = P( (X-µ)/σ ≤ (192-240) /25)  
=P(Z ≤   -1.92   ) =   0.02743

= 2.74%

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