How many computers? In a simple random sample of 135 households, the sample mean number of personal computers was 2.37. Assume the population standard deviation is o = 0.86. Part: 0 / 4 Part 1 of 4 (a) Construct an 80% confidence interval for the mean number of personal computers. Round the answer to at least two decimal places. An 80% confidence interval for the mean number of personal computers is