A survey of 100 people in a state found that, The probability that they take the subway each day is 0.85
The probability that they take a taxi each day is 0.6
The probability that they take the subway and a taxi each day is 0.55
If a person is selected at random, then determine the probability that they take either the subway or a taxi each day.

(b) suppose that consolidated power decides to use a level of significance of α = .05, and suppose a random sample of 100 temperature readings is obtained. if the sample mean of the 100 temperature readings is x⎯⎯ = 60.990, test h0 versus ha and determine whether the power plant should be shut down and the cooling system repaired. perform the hypothesis test by using a critical value and a p-value. assume σ = 5. (round your z to 2 decimal places and p-value to 4 decimal places.)