Can someone solve this please

7. Find 2? and s ofthe fre- uency distribution below: 8.) Community college students have a mean age of 23 with 5:3 years. University students have a mean age of 22 with 5:2 years. Brie is 27 and goes to a community college, while Ryan is 19 and goes to a university. Find the zscore for each. Which age is more extreme? ls either age unusual? Why or why not? 9.) TV channels must have 3 or 4 characters. The last character can be a letter or a digit, and the rest of the characters must be letters. How many such names are possible