In a random sample of size 200, the sample mean and the variance of the heights of the people in this sample are u cm and o? cm² respectively. It is known that the 90% confidence interval for the mean height of the population is (171.22 cm, 172.78 cm).

Q NO. 9. Find the values of u and o. (Give your answers correct to 2 decimal places if necessary.) A. 172, 6.71 3.174,8.32 C. 178,6.4 D.291,4.33

Q NO. 10. Hence, construct a 99% confidence interval for the population mean. (Give your answer correct to 2 decimal places.) A. (193.12cm, 194.45cm) B.(170.78cm, 173.22cm) C. (143.65cm, 144.47cm) D.(292.53cm, 294.45cm)