Chegg’s stock plunge on AI threat weighs on other online-education companies, as Duolingo shares tumble 10%

The big selloff in Chegg Inc.’s stock CHGG on the back of a downbeat revenue outlook is weighing on the shares of other online education companies. Chegg’s stock plummeted 46.3% in morning trading, enough the pace the New York Stock Exchange’s (NYSE) decliners, and put it on track to close at a six-year low. Elsewhere, shares of Duolingo Inc. DUOL tumbled 10.0%, of 2U Inc. TWOU shed 4.3%, of Coursera Inc. COUR slid 3.3% and Stride Inc. LRN gave up 3.2%. Among China-based education companies, the U.S.-listed shares of TAL Education Group TAL dropped 7.0%, of New Oriental Education & Technology Group Inc. EDU slumped 5.7%…