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This is a geometric progression problem. We can the general formula that can tell us how many flowers would be planted each month.
Let's write the terms that we know and see if we can find the pattern:
The patern here is obvious. Let's write it down:
This formula gives us a number of flowers planted in the n-th month.
Let's write the terms that we know and see if we can find the pattern:
The patern here is obvious. Let's write it down:
This formula gives us a number of flowers planted in the n-th month.
Mean is and a standard deviation is
, then the variable
.
Use substitution
.
This substitution gives you that .
a. For X=130, and
(the decimal value is taken from the Standard Normal Distribution Table).
b. For X=90, and for X=110,
. Then
(the decimal value is taken from the Standard Normal Distribution Table).