limiting a returned value?

[jb88ci]

I'm having trouble figuring this one out.

I'm putting together a grades database. We have a policy that if a student gets less than 70% on an exam they can rewrite it. Their final mark will then be the average of the first attempt and second attempt, not to exceed 70%

In the listed formula, f13 is the first attempt, g13 is the retest. I want H13 to either show f13(if the value is greater than 70) or if F13 is <70% show the average of F13,13 not to exceed 70%.

It does what i want except limit the displayed average

=IF(F13<0.7,AVERAGE(F13,G13),F13)

thanks in advance.