Pe is the answer he heft ty high
Standard deviation is the square root of the variance.
To find the variance from the standard deviation, raise it to the 2nd power:
Standard deviation = 4
Variance = 4^2 = 4x4 = 16.
Answer:
30 feet
Step-by-step explanation:
sea level = 0
up 20 feet
below 10 feet
total 30 feet