Hi RamakrishnanVaidyanathan!
I'm Jen, an independent advisor and a Microsoft user like you. I'd be happy to help you out with this issue.
Try selecting the numerical data only, not including the first-row-labels. Change your input range to $A$2:$C$13.
I hope this information helps. If you have any questions, please let me know and I'd be glad to assist you further.
Best Regards!
Jen :)