I need part 3 of 3 which says to find the standard deviation. Round your answer to one decimal place as needed

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. X 2 3 4 P(X) 0.1 0.3 0.2 0.2 0.2 Send data to Excel olo Part 1 of 3 Find the mean. Round your answer to one decimal place as needed. Mean: H= 2.1 Part 2 of 3 V Find the variance. Round your answer to one decimal place as needed. Variance: 6 1.7 Part: 2 / 3 Part 3 of 3 Find the standard deviation. Round your answer to one decimal place as needed