Find four geometric means between 25 and 800.

Actually, you have to find four missed terms of geometrical sequence. Denote

and r - ratio, then

.

Since , you have that , then

.

Now substitude r=2 in each of unknown 4 terms:

.

four geometric means between 25 and 800 are 50, 100, 200, 400.

15%

step-by-step explanation:

use the table and count the number of guesses that has two correct answers.

the following are two correct answers

10010, 01100, 11000

a total of 3 numbers having 2 correct guesses out of 20 questions.

probability of getting 2 correct guesses = the number of questions getting 2 correct answers / total number of questions.

= 3/20

to convert it into percent multiply by 100, we get

= 3/20 * 100

= 15%

the answer is 15%

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