Question

Fitness Machine A fitness center bought a new exercise machine called the Mountain Climber. They decided to keep track of how many people used the machine over a 3-hour period. Here X is the number of people who used the machine. ol x 0 1 2 3 4 PX 0.3 0.2 0.2 0.1 0.2 Send data to Excel Part 1 of 3 Find the mean. Round your answer to one decimal place as needed. Mean: u= 1.7 Part 2 of 3 Find the variance. Round your answer to one decimal place as needed. Variance: 62 2.3 Part: 2 / 3
I am having trouble with all 3 parts :|

Answer 1

Solution X. p(x) x. P(x) X +2 0.3 o O 0 o 0.2 1 0.2 0.2 2 0.2 4 0.8 0.4 0.3 3 9 0.9 4 0.2 16 3.2 0.8 Sum= 30 5.1 ... The probability total always is one Mean u = 3X.P(x 1.7 1.7 2 variance is = Sx². P(x)-(w² 5.1 - (1.772 5.1 - 2.89 2.21 = 2.2 2 standard deviation = VO 2.21 = 1:49 6 = 1.5