Let A mortality study is based on observations during the period January 1, 2019, through December 31, 2021. Five policies were observed, with the following information recorded. For simplicity, a date of 3-1995 is interpreted as March 1, 1995, and all events are treated as occurring on the first day of the month of occurrence. Furthermore, all months are treated as being one-twelfth of a year in length. 1. Born 2-1980, purchased insurance policy on 8-2018, was an active policyholder on 1-2022. 2. Born 4-1980, purchased insurance policy on 7-2018, died 9-2020. 3. Born 6-1980, purchased insurance policy on 2-2020, died 2-2021. 4. Born 3-1980, purchased insurance policy on 6-2019, died 3-2020. 5. Born 5-1980, purchased insurance policy on 3-2019. surrendered policy on 5-2021. a. Estimate all possible mortality rates at integral ages, using: 1) Exact exposure method; and 2) Actuarial exposure method b. Suppose we assigned insuring ages by age last birthday. Use the actuarial exposure method to estimate all possible mortality values