Hi!
<u>For your first question:</u>
When it looks like this, with an exponent, then parentheses, then an exponent, we should multiply the exponents.
^10
<em>P.S. As for your second question, I believe I already answered that on your other question!</em>
Answer:
0.0668
Step-by-step explanation:
Assuming the distribution is normally distributed with a mean of $75,
with a standard deviation of $12.
We can find the z-score of 78 using;
Using our normal distribution table, we obtain the area that corresponds to 0.25 to be 0.9332
This is the area corresponding to the probability that, the average is less or equal to 78.
Subtract from 1 to get the complement.
P(x>78)=1-0.9332=0.0668