Flight times for commuter planes are normally distributed, with a mean time of 94 minutes and a standard deviation of 7 minutes. using the empirical rule, approximately what percentage of flight times are between 80 and 108 minutes.
32%
68%
95%
99.7%

The percent of flight times between 80 and 108 minutes  is 95% ⇒ 3rd answer

Step-by-step explanation:

* Lets revise the empirical rule

- The Empirical Rule states that almost all data lies within 3

 standard deviations of the mean for a normal distribution.  

- 68% of the data falls within one standard deviation.  

- 95% of the data lies within two standard deviations.  

- 99.7% of the data lies Within three standard deviations  

- The empirical rule shows that

# 68% falls within the first standard deviation (µ ± σ)

# 95% within the first two standard deviations (µ ± 2σ)

# 99.7% within the first three standard deviations (µ ± 3σ).

* Lets solve the problem

- Flight times for commuter planes are normally distributed, with a

 mean time of 94 minutes and a standard deviation of 7 minutes

∴ μ = 94

∴ σ = 7

- One standard deviation (µ ± σ):

∵ (94 - 7) = 87

∵ (94 + 7) = 101

- Two standard deviations (µ ± 2σ):

∵ (94 - 2×7) = (94 - 14) = 80

∵ (94 + 2×7) = (94 + 14) = 108

- Three standard deviations (µ ± 3σ):  

∵ (94 - 3×7) = (94 - 21) = 73

∵ (94 + 3×7) = (94 + 21) = 115

- We need to find the percent of flight times between 80 and 108 min

∵ The empirical rule shows that 95% of the distribution lies within

   two standard deviation in this case, between 80 and 108  min

∴ The percent of flight times between 80 and 108 minutes  is 95%

c > -10.55

step-by-step explanation:

i get you, what you should do is think of the positive things that would come out of it. it will make yours parents proud and raise your grade. you should always try and if you can't focus tell the teacher.