Standard deviation = √(n * p * q)
You are given n and p
q = 1 - p
q = 1 -0.2 = 0.8
Standard deviation = √(21 * 0.2 * 0.8)
=√3.36 = 1.83
The answer is A.
Answer:
Part A: yes
Part B: 50%
Step-by-step explanation:
There are two ways we can use a normal approximation for a sample: if the population it is from is normally distributed, or if the sample is sufficiently large (n > 30). In this case, we don't know if the population is normally distributed, but we do know the sample size is larger than 30, so we can use normal approximation.
The sample proportion is normally distributed, with a mean equal to the mean of the population. So there is a 50% chance that sample proportion is less than the population proportion.
B. Carl's answer is correct but he incorrectly labeled the leg lengths in step 2.
Answer:
$8.43 perhour
Step-by-step explanation:
210.75 / 25 = 8.43
Answer:
-31.2x + 28.7y + 10.5
Step-by-step explanation:
Step 1: Write expression
2.5(4.2 + 7.4y) - 3.6(8x - 4.5y) - (2.4x + 6y)
Step 2: Distribute
10.5 + 18.5y - 28.8x + 16.2y - 2.4x - 6y
Step 3: Combine like terms
-31.2x + 28.7y + 10.5
