Question 1206327
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As the other tutor points out, BinomDist is a great spreadsheet function to use. 
You can generate a table as indicated and add up the values using the Sum command. Manually adding the values would be fairly tedious busy-work.


A quicker shortcut would be to use the cumulative flag of the BinomDist function.


The cumulative flag is the value of L at the end in the template
BinomDist(k, n, p, L)
If L = 0, then it computes an individual binomial value.
If L = 1, then it computes a cumulative sum


Typing in <font color=blue>=BinomDist(13,20,0.25,1)</font> will compute the binomial sum from k = 1 to k = 13.
The result of this calculation is approximately 0.999970488
Subtract this from 1 to determine the sum from k = 14 to k = 20.
1 - 0.999970488 = <font color=red>0.000029512</font>
Round this however instructed.


Side note: if your spreadsheet displays 2.9512E-05, or something along those lines, it means 2.9512 * 10^(-5). Then the -5 exponent moves the decimal point 5 spots to the left to arrive at 0.000029512
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