My family owned two Honda Civics. One of them is 1999 and lasted 8.5 years without a major repair. Other one (2002) lasted 9.5 years, but the distribution of 2002 Honda Civic had higher mean (8.5) with a standard deviation of 2.1 years. Which Honda Civic did better relative to other Honda Civics from the same year? (compare z scores from different normal distributions:1999 and 2002).

 is better

Step-by-step explanation:

1999                          2002

x = 8.5                       x = 9.5

μ = 7.5                       μ = 8.5

σ = 1.8                        σ = 2.1

 = x - μ / σ

        = 8.5 - 7.5 / 1.8

         = 0.5556

 = x - μ / σ

        = 9.5 - 8.5 / 2.1

         = 0.4762

 is better

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step-by-step explanation:

the total estimated nappy use.=10,500,000

step-by-step explanation:

given that on an average the average baby uses 3528 napkins.

in a particular year 2014, the number of births were 299697 in new south wales.

rounding off the number of births to the nearest hundred thousand we have

no of birtsh = 300000

also rounding off the average usage to nearst thousand we get

average use of a baby = 3500

hence total number of nappy estimated to be used = 3500x300000

= 10,500,000

answer is 10,500,000 nappies