I think it would be y plus 3 times 2 equals 5x. I'm not sure if that is what they are asking for.
so if you take away 1/4 from 3/4 you will get 2/4
3/4 - 1/4 = 2/4 or 1/2
so the male elephant weights 1/2 a ton more than the female
Answer:
The value of the test statistic is -2.64.
Step-by-step explanation:
The test statistic is:

In which X is the sample mean,
is the expected(claimed) mean,
is the standard deviation and n is the size of the sample.
An automobile manufacturer claims that its van has a 40.3 miles/gallon (MPG) rating.
This means that 
After testing 250 vans, they found a mean MPG of 39.9. Assume the standard deviation is known to be 2.4.
This means, respectively, that:

So



The value of the test statistic is -2.64.