After collecting all of the data, you determine that the finishing times are normally distributed with a mean of 2.8 hours and a standard deviation of .4 hour. a. what is the probability that a randomly chosen athlete completed the walk between 2 and 3.2 hours?
b. what is the probability that two randomly chosen athletes completed the walk in 3.6 hours or more?
c. what is the probability that four randomly chosen athletes completed the walk between 2 and 2.8 hours?

step-by-step explanation:

de-gf

hj=3x+20

ji=15x-64

i believe the answer is the polygon, heptagon.

c.   x=2.4cm

step-by-step explanation:

similar triangles are triangles which have the same shape but not the same size. this means their angle measures are equal but their side lengths are not instead they are proportional. to solve, we will set up a proportion and solve.

a proportion is two equal ratios set equal to each other. we form the ratios by finding corresponding sides (sides which match to each other on both triangles by their position). out ratios will be one side of the small triangle over the corresponding side on the big triangle as shown below:

.

to solve the proportion, we'll cross multiply by multiplying numerator with denominator across the equal sign.

54 km / hours

step-by-step explanation:

we need to convert seconds to hours

60 seconds = 1 minutes

60 minutes = 1hour

15 m         60 second   60 minutes

  * *         = 54000 meters/ hour

second     1 minute             1 hour

now we need to convert meters to km

1000 m = 1 km

54000 m       1 km

*   = 54 km / hours

hour               1000m