Let's consider the total number of gumballs to be the variable g. Based on the problem, g * 1/4 = 140. Now, multiply by 4 on both sides to cancel the 1/4 to get g = 560.
Answer:
10-52.85ft squared 11-144.84centimeters squared 12-304meters squared
Step-by-step explanation:
A-bh/2 10-7*15.1=105.7/2=52.85ft squared
A-bh 11-10.2*14.2=144.84cenitmeters squared
A-bh 20*15.2=304meters squared
Answer:
The standard error of a proportion p in a sample of size n is given by: 
Step-by-step explanation:
Central Limit Theorem
The Central Limit Theorem establishes that, for a normally distributed random variable X, with mean
and standard deviation
, the sampling distribution of the sample means with size n can be approximated to a normal distribution with mean
and standard deviation
.
For a skewed variable, the Central Limit Theorem can also be applied, as long as n is at least 30.
For a proportion p in a sample of size n, the sampling distribution of the sample proportion will be approximately normal with mean
and standard deviation
In this question:
The standard error of a proportion p in a sample of size n is given by: 
Answer:
X is anywhere from 7 or any number bigger than 7.
For A the answer is 85% correct. Then 15% incorrect. I got the number correct by taking 68 and dividing by 80. To get the number incorrect I took the 15 other questions (80-68) and did 12 divided by 80 to get the 15% incorrect.