X= largest integer
X-1=next integer
X-2=lowest integer x + x-1 + x-2 = 267
3x-3=267
3x=267+3
3x=270
X=270÷3
X=90
Now substitute x + x-1 + x-2 = 267
90+ (90-1)+(90-2)=267
90+89+88=267 So largest integer is 90
I think its b but i am not surely sure so you might want to check with someone else
Answer:
2.35%
Step-by-step explanation:
Mean number of months (M) = 39 months
Standard deviation (S) = 10 months
According to the 68-95-99.7 rule, 95% of the data is comprised within two standard deviations of the mean (39-20 to 39+20 months), while 99.7% of the data is comprised within two standard deviations of the mean (39-30 to 39+30 months).
Therefore, the percentage of cars still in service from 59 to 69 months is:

The approximate percentage of cars that remain in service between 59 and 69 months is 2.35%.
eu não sei, desculpe companheiro, não me denuncie