A researcher wishes to estimate the proportion of X-ray machines that malfunction. A random sample of 175 machines is taken, and 35 of the machines in the sample malfunction. Based upon this, compute a 90% confidence interval for the proportion of all X-ray machines that malfunction. Then find the lower limit and upper limit of the 90% confidence interval. Carry your intermediate computations to at least three decimal places. Round your answers to two decimal places. (If necessary, consult a list of formulas.) Lower limit: I Upper limit:

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