I get z= 1.40 and so the confidence 91.92% but the book says 84.14%.

Can you check it out please?

Of a random sample of 198 students 98 rated the case of resume inflation as unethical. Based on this info, a statistician computed for the population proportion a confidence interval extending from 0.445 to 0.545. What's the confidence level of this interval?

Thank you for all your help.