The best estimate of the percent of one-bedroom apartments in the city with a monthly rent of at most $800 is 1.3%.
A percentage is a number or ratio expressed as a fraction of 100. is often described. A percentage is a part of a whole expressed as a number between 0 and 100, not as a fraction. Everything is 100%, half of it is 50%, and nothing is 0%. To get a percentage, divide part of the whole by the whole and multiply by 100.
Mean = \mu = 936
standard\ deviation = \sigma =61
To find
P(X<800)=P(\frac{X-\mu }{\sigma }<\frac{800-936}{61})
P(X<800)=P(z<-2.2295)
P(X<800)=0.01289
0.01289\times 100 = 1.289\approx 1.3% percent.
Hence, option 4) is correct is the best estimate of the percent of one-bedroom apartments in the city with a monthly rent of at most $800.
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