It is claimed that the expected length of time some computer part may work before requiring a reboot is 26 days. in order to examine this claim 80 identical parts are set to work. assume that the distribution of the length of time the part can work (in days) is exponential. the central region that contains 70% of the distribution of the average is of the form e(x) ± c, where e(x) is the expectation of the sample average. the value of c is (you are asked to apply the normal approximation to the distribution of the average of the 80 parts that are examined. the answer may be rounded up to 3 decimal places of the actual value.)

the monthly balance will be $75,000

i believe that the answer is

b. y-1=-2(x-4)

hope this !

hello!

to begin with, we're given that on earth, a rock weighs 20 pounds, and while on jupiter, that same rock weighs 42 pounds. now, we're trying to find the weight of a rock that weighs 10.5 pounds on earth, on jupiter.

to solve this, first, set up a proportion, cross-multiply, and solve it algebraically.

setting up the proportion is the hardest and the most confusing part of the problem, but it's simple.

if on earth, the rock weighs 20 lbs, and on jupiter it weighs 42 lbs, our first part of our proportion is 20/42 lbs. the second part has to be equal to each other. this means that 10.5 has to be on the numerator of the fraction, and x, the value we're trying to find, has to be on the denominator. remember that the rock weighs 10.5 lbs on earth, and we're trying to find the weight of it on jupiter (which is x).

20/42 = 10.5/x

next, you would cross-multiply.

20x = 42(10.5)

20x = 441

now, solve it algebraically by using division.

x = 22.05 lbs

this can be rounded to 22.1 lbs.

therefore, the weight of the rock on jupiter is 22.1 lbs, the fourth choice.