2. Over a period of many months, a particular 5 year old boy's play ac- tivity was observed. The length of time spent in each episode of play with toys was recorded. The paper "A Temporal Analysis of Free Toy Play and Distractibility in Young Children" (Journal of Experimental Child Psychology, 1991, pages 41-69) reported the accompanying data on the play-episode lengths. Length of time spent in play-episode (seconds) Frequency 0 - less than 5 54 5 - less than 10 10 - less than 15 28 15 - less than 20 21 20 - less than 10 31 10 - less than 60 15 60 - less than 90 16 90 - less than 120 5 120 - less than 180 8 a. Display this information in a density histogram. b. Use the density histogram to estimate the proportion of play- episodes that lasted at most 75 seconds