What are all values of x for which the graph of y= 6x^2 + x/2 + 3 + 6/x is concave downward?

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Results of concept rating for new wine cooler rating of the appeal of the phrase as it relates to the new wine cooler total sample gender age male female 21 - 24 25 -34 35-49 extremely appealing (5) 151 68 83 48 63 40 somewhat appealing (4) 91 51 40 36 32 23 neither appealing nor not appealing (3) 36 21 15 9 16 11 somewhat unappealing (2) 13 7 6 4 6 3 not at all appealing (1) 9 3 6 4 3 2 quantity purchased per person in 4 weeks # of 6-packs purchased x # people who purchased 0 7 1 6 2 6 3 13 4 14 5 12 6 10 7 5 8 5 9 5 10 2 drinking temperature sample # temperature 1 52 2 46 3 50 4 42 5 52 6 50 7 39 8 44 9 49 10 39 11 47 12 46 13 43 14 52 15 49 16 47 17 49 18 52 19 50 20 47 21 49 22 38 23 57 24 49 25 49 26 57 27 45 28 58 29 54 30 44 what is the probability that a randomly selected 21 to 49 year old consumer is a males who gives the phrase a rating of 4?