stats mean difference?
The American Veterinary Association claims that the annual cost of medical care for a dog has a mean of $100 with a standard deviation of $30, while the annual cost of care for a cat has mean $120 and standard deviation of $35.
Give the mean of the difference in annual cost between one cat and one dog (do as cat cost - dog cost). Enter as dollars to the nearest cent (i.e. 10.91)
- AlanLv 71 month ago
when adding or subtracting
the means add and subtract
the variance add.
(cat - dog) mean = 120-100 = $20.00
so the answer to your question is simply $20.00
or Twenty dollars
but the variance = 30^2 + 35^2 = 2125
new standard deviation = sqrt(variance) = sqrt( 2125) = $46.09772229
or $46.10 rounded to the nearest penny