<span>Ans : a)
What is the standard deviation of this sampling distribution?
Ď /âšn
= 60/âš840
=2.0702
b)
1 standard deviation of the mean
= (1) 2.07
= 2.07
c)
272+/- 1(2.07)
(269.93, 274.07)</span>
well, let's see the 10-pack is $15.37 BUT each of those 10 bars are 2.1 oz, so for the whole package you're getting really 10 * 2.1 = 21.0 oz.
the 12-pack costs $15.35 BUT each of those 12 bars are 1.4 oz, so for the whole package you're getting 12 * 1.4 = 16.8 oz.
which is the better deal? which one gives you more ounces for the money? after all, you're going to eat the bars, so you want more ounces, not more bars.
![\bf \cfrac{15.37}{21}\cfrac{\$}{oz}~~\approx ~~0.73~\frac{\$}{oz}~\hspace{10em} \cfrac{15.35}{16.8}\cfrac{\$}{oz}~~\approx ~~0.91~\frac{\$}{oz}](https://tex.z-dn.net/?f=%5Cbf%20%5Ccfrac%7B15.37%7D%7B21%7D%5Ccfrac%7B%5C%24%7D%7Boz%7D~~%5Capprox%20~~0.73~%5Cfrac%7B%5C%24%7D%7Boz%7D~%5Chspace%7B10em%7D%20%5Ccfrac%7B15.35%7D%7B16.8%7D%5Ccfrac%7B%5C%24%7D%7Boz%7D~~%5Capprox%20~~0.91~%5Cfrac%7B%5C%24%7D%7Boz%7D)
so clearly you'd want to get the cheapest one with more ounces, so at $0.73 or 73 cents for each ounce, the 10-pack is the cheapest.
A + B + C = 180
x + 2x + 2 + 3x + 4 = 180
6x + 6 = 180
6x = 174
x = 29