8. The specimen of copper wirer drawn from a large lot have the pollowing breaking strongth (in kg weight] 578,572, 570, 568,572,578,570, 572,598, 544 , Test whether the mean breaking strength of the lot may be taken to be 578 kg weight at 5% level of significance

b

step-by-step explanation:

thats not a system of equations, that is a solution

yes

step-by-step explanation:

so of course you want to start by plugging the 5 in which goes to 7(5)+3(5)=50 because 7*5=35 and 3*5=15 and then add them together, then plug in the 5 to the other equation as well 9(5)+5=50 because 9*5= 45 and then add 5 and so yes they are equivalent.