Add an intersection with a red light times are normally distributed with a mean time of three minutes and a standard deviation of .25 minutes approximately what percent of my lights last between 2.5 and 3.5 minutes

2.5 and 3.5 are two standard deviations from the mean, since 2.5 = 3 - 2(0.25) and 3.5 = 3+2(0.25).

The empirical (68-95-99.7) rule says that approximately 95% of a normal distribution falls within two standard deviations of the mean.

f

step-by-step explanation:

f

dc=6 square root of 3 and ac is 12 square root 3

c and d

step-by-step explanation:

square root of 3/2 = 18/c

cross multiply to get 18*2=√3*c

36/√3 * √3/√3 = c

c= 36*√3/3

c=12√3