Answer:
No, Tanzania does not need help.
How would I know? I'm not Tanzania!
Explanation:
Answer:
68.74%
Explanation:
To find the Standard Deviation:
First find expected return.
(0.7*100%)+(0.3*-50%) =70-15= 55%
Then the Variance.
[0.7*(1-0.55)^2]+[.3*(-0.5-0.55)^2]
=0.14175+0.33075
=0.4725
=47.25%
The Standard Deviation is the square root of the variance.

=0.6874
=68.74%
The water would rush into the cell and the cell will explode.