Well, first since i split this up into 3 shapes. Then I multiplied 4x8 which was 32 and since there were two,it would be another 32. Then I multiplied 12x4 which was 48. Then I added 32+32+48 which equaled 112 square feet.

3 0

4 years ago

The final exam scores in a statistics class were normally distributed with a mean of 70 and a standard deviation of five. What i

sp2606 [1]

The probability that a student scored less than 55% on the exam is 0.134%.

<h3>What is a normal distribution?</h3>

It's the probability curve of a continuous distribution that's most likely symmetric around the mean. On the Z curve, at Z=0, the chance is 50-50. A bell-shaped curve is another name for it.

We have:

Mean of the sample = 70

Standard deviation = 5

= P(X<55%)

Z = (55-70)/5

Z = -3

P(X < -3)

From the Z table:

P(x<-3) = 0.0013499

P(x<-3) = 0.134%

Thus, the probability that a student scored less than 55% on the exam is 0.134%.

Learn more about the normal distribution here:

brainly.com/question/12421652

#SPJ1

8 0

2 years ago