Could someone please confirm if I answered question 8 correctly? Use the followi
ID: 3359675 • Letter: C
Question
Could someone please confirm if I answered question 8 correctly? Use the following density curve to answer questions 7 acir cars to ustributi neighborhoods own more than one car but consider nled by a vehicle. The age of these family vehicles can be mode years and standard deviation 6 months and 8: Many res : Many residents of suburban one of their cars to be the main by a normal distribution with mean 7. What percentage of family vehicles is between I and 3 years old? A) Canno B) 68% C) 95% D) 99.7% t be determined based on the information given. 8. What percentage of family vehicles is more than 3 years old? A) 47.5% B) 3490 C) 95% D) 2.5%Explanation / Answer
The mean value is not visible and will be assumed to be 2 years
Formula: Z = (X - mean)/SD
7) Since the mean is 2 years, the values 1 and 3 falls 2 standard deviations to either side of the mean.
Using 68 95 99.7 rules, 95% of the data lies within 2 standard deviation from the mean
Answer: C)95%
8) Since this is above 2 standard deviations from the mean, 2.5% of the data will lie to the right
For 2 standard deviation from the mean, 95% lies in the middle and 5% is shared between the two tails
Answer: D) 2.5%