A Tesco spokesman said:
This product was uploaded to the website by a third party seller but was removed from sale immediately because we found it offensive.
The webpage should have been removed at that time and we are looking into why it is still visible two months later.
We have very clear guidelines for third party sellers who list items on our website, and are very sorry that on this occasion they weren't followed.
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Sadly, these high-school students have already received the most abrupt and cynical lesson of their lives.
A top temperature of 9 or 10 Celsius (48-50 F).
The poll comes ahead of a debate in the House of Commons on Friday on a new Bill which would introduce such a system in England.