Descriptive statistics

[FrancesH1810]

For my dissertation, my supervisor wants me to carry out descriptive statistics for some of my questions; I am trying to carry out descriptive statistics for one of my questions which contains different age categories (such as 18-20, 60+, and a prefer not to say option) but whenever I try to carry this out, I keep getting a message saying 'input range contains non-numeric data'. Why is this happening? I'm struggling to carry out descriptive statistics on SPSS so I want to do it on Excel instead.

[#2]

@FrancesH1810 Sounds like the data in your Excel file isn't "clean": Numbers recognized as numbers for example, but rather seen/treated as text.
When you select the cells which should contain numbers, a small icon should appear. Click that icon it will allow you to change the numbers to numbers:

[#3]

@Jan Karel Pieterse thank you