Error in CFAI book (Economics)?

In CFAI book for Level1, Book 2, Reading 15, Exhibit 5 (p 108), there are no MR or AR curves, only a dotted line. Is this normal or an error?? I feel like I’m going crazy. Thanks in advance for any comments!

Good catch, they seem to have missed the MR curve. It should be download sloping, and steeper than the demand curve.

MR = (Delta TR) / (Delta Q)

TR is maximum when MR = 0