20 is the expected value of x?
6.2

6.05

5.95

5.6

x 3 4 5 7 9
p 0.2 0.1 0.25 0.05 0.4

answer:

t=51

step-by-step explanation:

given

360 = 20\sqrt{t+273} ( divide both sides by 20 )

18 = \sqrt{t+273} ( square both sides )

18² = t + 273, that is

t + 273 = 324 ( subtract 273 from both sides )

t = 51

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