A biologist wants to know the width w of a river so that instruments for studying the pollutants in the water can be set properly. From point A the biologist walks downstream x = 140 feet and sights to point (see figure). From this sighting, it is determined
that 0 = 54º. How wide is the river?
8=54
ΑΣ
(Round your answer to three decimal places.)
ruc

197.693
202.693
212.693
207.693
192.693
e

(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.)