STAT 135 Lecture 1: stat135_lec1

On a sea-level standard day, a pressure gage, moored below the surface of the ocean (SG = 1.025), reads an absolute pressure of 1.4 MPa. How deep is the instrument? (a) 4 m, (b) 129 m, (c) 133 m, (d) 140 m, (e) 2080 m

a sample of n = 25 scores has m = 20 and s2 = 9. what is the sample standard deviation?

2. While conducting experiments, a marine biologist selects water depths from a uniformly distributed collection that vary between 2.00 m and 7.00 m.

1. What is the probability that a randomly selected depth is less than 3.50 m? 
2. What is the probability that a randomly selected depth is between 2.15 m and 5.50 m? 
3. What is the expected value of the water depth? 
4. What is the standard deviation of the water depth?