Diagnostic Test То
28
In a 5-kilometer race, the average finishing time was 33 minutes, with a standard deviation of 2 minutes. What percentage of the
racers finished in 29 minutes or less?
Note: Assume that a Normal model is appropriate for the distribution of finishing times.
ОА.
about 16%
ОВ.
about 97.5%
Ос.
about 2.5%
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idk

step-by-step explanation:

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional

here is a big fat