Your investment advisor proposes a monthly income investment scheme which promises a variable income each month. You will invest in it only if you are assured an average monthly income of at least TTE} dollars. Your advisor also tells you that, for the past 61 months, the scheme had incomes with an average value of T86 dollars and a standard deviation of 96 dollars. {a} Create an 80% confidence interval for the average monthly income of this scheme. (Round your ansvvers to 4 decimal places, if needed} (S. S} {b} Based on this confidence interval, should you invest in this scheme? 0 Yes, since the interval is completely above $70. 0 Yes, since the interval contains 7'70. 0 No, since the interval contains 7'70. 0 No, since the interval is completely above ??0