Answer:
the answer is D
Step-by-step explanation:
they divided
0.84(because 20% of the observations are about 0.84)
You've found the 80th percentile! The 80th percentile of the standard normal distribution is 0.84. That's because 80% of the observations fall below 0.84. (Note: The 80th percentile of every normal distribution is 0.84 times the standard deviation above the mean.)
Answer: 14
Step-by-step explanation:
By the geometric mean theorem,

I was Thinking it out on my art pad
A=(1/2)
bh A=(1/2)*10*12
A=5*12=60 sq cm
4*60=240 sq cm
A=s*s A=10*10=100 sq cm
240+100=340 sq cm
so A