You were charged interest of $6.31 for purchases (near section 8) why? ( WILL REWARD AND MARK BRAINLIEST !!

a. You paid off your entire balance from the month before

b. You had a balance of $535.07 from the previous month and only paid $450.00 so you didn’t pay off your balance in full

c. You borrowed more than your credit limit and were charged interest in the amount you borrowed over your limit

d. The credit card company paid you interest for the purchases you made on their credit card

Atechnician compares repair costs for two types of microwave ovens (type i and type ii). he believes that the repair cost for type i ovens is greater than the repair cost for type ii ovens. a sample of 6767 type i ovens has a mean repair cost of $79.79$⁢79.79. the population standard deviation for the repair of type i ovens is known to be $19.18$⁢19.18. a sample of 5555 type ii ovens has a mean repair cost of $75.24$⁢75.24. the population standard deviation for the repair of type ii ovens is known to be $21.40$⁢21.40. conduct a hypothesis test of the technician's claim at the 0.050.05 level of significance. let μ1μ1 be the true mean repair cost for type i ovens and μ2μ2 be the true mean repair cost for type ii ovens. step 2 of 4 : compute the value of the test statistic. round your answer to two decimal places.