Answer: 
Step-by-step explanation:
When the scientists detect a signal frequency from the ocean floor, then the depth of submarine =
feet
=
feet
When they dive farther to check the signal, then the depth of the submarine=
feet.
The net change in their elevation =

Answer:
the 4th one
I guess
if this is the wrong answer then let me know
Answer:
0.02275
Step-by-step explanation:
Standard deviation is the square root of variance
Standard deviation= Square(0.0025)= 0.05
Because of the normally distributed, the z- score for 0.9 inches is:
(0.9-0.8)/0.05= 2
-> P(x<= 0.9)= P(2) = 0.97725
-> P (x>= 0.9)= 1-0.97725 = 0.02275