Answer:
The upper 20% of the weighs are weights of at least X, which is 
, in which 
is the standard deviation of all weights and 
is the mean.
Step-by-step explanation:
Normal Probability Distribution:
Problems of normal distributions can be solved using the z-score formula.
In a set with mean and standard deviation , the z-score of a measure X is given by:
The Z-score measures how many standard deviations the measure is from the mean. After finding the Z-score, we look at the z-score table and find the p-value associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.
Upper 20% of weights:
The upper 20% of the weighs are weighs of at least X, which is found when Z has a p-value of 0.8. So X when Z = 0.84. Then
The upper 20% of the weighs are weights of at least X, which is , in which is the standard deviation of all weights and is the mean.
Answer:
15
- Step-by-step explanation:
because because 300 divided by 20 equals 15 hope this helps
Answer:
Its A
Step-by-step explanation:
Answer:
0.002
Step-by-step explanation:
Answer: 374416
Step-by-step explanation:
Given : A test requires that you answer first Part A and then either Part B or Part C.
Part A consists of 4 true false questions, Part B consists of 6 multiple-choice questions with one correct answer out of five, and Part C consists of 5 multiple-choice questions with one correct answer out of six.
i.e. 2 ways to answer each question in Part A.
For 4 questions, Number of ways to answer Part A = 
5 ways to answer each question in Part B.
For 6 questions, Number of ways to answer Part B = 
6 ways to answer each question in Part C.
For 5 questions, Number of ways to answer Part C = 
Now, the number of ways to completed answer sheets are possible :_
Hence, the number of ways to completed answer sheets are possible = 374416
