8. The gure below shows the composite develop- mental skill level of chessmasters at different ages as determined by their performance against other

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8. The ﬁgure below shows the composite develop-mental skill level of chessmasters at different agesas determined by their performance against otherchessmasters. (From ”Rating Systems for HumanAbilities,” by W.H. Batchelder and RS. Simpson,1988. UMAP Module 698.) (a) At what age is the ”typical" chessmaster play-ing the best chess? (b) At approximately what age is the chessmas—ter’s skill level increasing most rapidly? (c) Describe the development of the "typical”chessmaster’s skill in words. (d) Sketch graphs that you think would reason—ably describe the performance levels versusage for an athlete, a classical pianist, a rocksinger, a mathematician and a professional inyour major field. 2000 oonposilc dcvclopmcnlalskill lcvcl 'n chess skill level 20 30 40 SD 60age (years)