Find the probability of selecting a z score less than 1.81

The probability of selecting a z score less than 1.81 is 0.9649 or 96.49%

Step-by-step explanation:

Z score represents the number of standard deviations that the score is either above or below the mean.

If the Z score is 0, the score is identical to the mean score. Hence its probability becomes 50% as equal parts of score are below the mean and above the mean.

As here the z score is given to be 1.81, from the Z score table we get,

answer is the third choice:

3x^5+4x^4+x^3+2x^2-10x-7=0

step-by-step explanation:

you didn't post any answer choices, so its not 100% clear what your teacher is looking for

however, log(15/7) is equivalent to log(15) - log(7)

i'm using the rule log(x/y) = log(x) - log(y)