Incomes in a particular market area are known to be right-skewed ...

[Destiiny22]

Incomes in a particular market area are known to be right-skewed with a mean equal to 33,100.
 
  In a report issued recently, a manager stated that at least 89 percent of all incomes are in the range of 26,700 to 39,500, and this was based on Tchebysheff's theorem. Given these facts, what is the standard deviation for the incomes in this market area?A) Approximately 6,400
  B) Approximately 3,200
  C) Approximately 2,133
  D) Approximately 4266

Question 2

A major U.S. automaker has determined that the city mileage for one of its new SUV models is normally distributed with a mean equal to 15.2 mpg.
 
  A report issued by the company indicated that 22 percent of the SUV model vehicles will get more than 17 mpg in the city. Given this information, what is the city mileage standard deviation for this SUV model?A) 0.77 mpg
  B) Approximately 2.34 mpg
  C) 1.8 mpg
  D) Approximately 3.1 mpg

[uniquea123]

Answer to Question 1

C

Answer to Question 2

B

[Destiiny22]

Excellent

[xiaomengxian]

Gracias!