A researcher wishes to estimate the proportion of X-ray machines that malfunction. A random sample of 225 machines is taken, and 49 of the machines in the sample malfunction. Based upon this, compute a confidence interval for the proportion of all X-ray machines that malfunction. Then find the lower limit and upper limit of the confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places

it is true

step-by-step explanation:

all the combinations add up i used   calculator

the solution of the equation is 2.23 ⇒ answer b

step-by-step explanation:

* lets revise the meaning of exponential function

- the form of the exponential function is y = ab^x, where a ≠ 0, b > 0 ,  

  b ≠ 1, and x is any real number

- it has a constant base b

- it has a variable exponent x

- to solve an exponential equation, take the log or ln of both sides,  

  and solve for the variable

* lets solve the problem

∵

- the base is 7 and the exponent is x

- insert ㏑ in both sides

∴

- use the rule

∴ x ㏑(7) = ㏑(77)

- to find x divide both sides by ㏑(7)

∴

* the solution of the equation is 2.23 to the nearest 2 decimal places

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce