Consider the following data. Score1: 90 80 70 65 95 . 77 Score2: 80 90 60 70 60 88 . Income: 95 79 74 88 85 50 . Gender: f m m f f m f Write a program to do the following. 1. Using data above, create a data set. 2. Create MS1: = score1 if not missing; =.5 of score2 if score1 is missing. 3. Create MS2: = score2 if not missing; =.5 of score1 if score2 is missing. 4. Create a new variable representing the mean of MS1 and MS2. Provide a summary for the newly created variable. 5. Create a variable representing the letter grade as follows: A if mean score greater or equal to 90; B if it is between 75 and 90; C if between 60 and 75; F if less than 60. Provide a summary of the newly created variable. 6. Create IM: = income if income not missing; =0 if income is missing. Provide a summary for the new variable. 7. Create a new variable representing the level of income (=IM) as follows: H if income is above 90; M if it is between 40 and 90; L if it is lower than 40. Provide a summary for the new variable.