help finding critical value

Question 3 - of 5 Step 3 of 4 0 A random sample of 10 parking meters in a beach community showed the following incomes for a day. Assume the incomes are normally distributed. $3.60 $4.50 $2.80 $2.60 $5.20 $6.75 $4.25 $8.00 $6.30 $3.00 Using these data, construct a 99% confidence interval for the true mean income. Step 3 of 4: Find the critical value that should be used in constructing the confidence interval. Answer 2 Points Tables Keyboard S Ot = 3.169 rev Oz = 2.575