1. The interest rates on 30-year mortgages offered by 10 randomly selected banks in NCR are recorded below.

7.5%

8.0%

8.5%

7.25%

6.50%

5.75%

6.75%

8.25%

9.0%

7.0%

1. Find the mean, median, and mode.
2. Calculate the sample variance of the interest rates.
3. Calculate the sample standard deviation of the interest rates.
4. Calculate the range of the interest rates.

2. The table below is a frequency distribution of the credit card rate charged by the top 150 issuers.

Credit Card Rate	Frequency
22.51%-24.50%	27
20.51%-22.50%	19
18.51%-20.50%	48
16.51%-18.50%	36
14.51%-16.50%	8
12.51%-14.50%	12

1. Calculate the average credit card rate charged by the top 150 issuers based on the frequency table.
2. Calculate the variance credit card rate charged by the top 150 issuers based on the frequency table.
3. Calculate the standard deviation credit card rate charged by the top 150 issuers based on the frequency table.