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.
False,that is not true because
Answer:
Hope you will understand and it will help you
120: 1, 2, 3, 4, 5, 6, 8, 10, 12, 15, 20, 24, 30, 40, 60, 120
210: 1, 2, 3, 5, 6, 7, 10, 14, 15, 21, 30, 35, 42, 70, 105, 210
Given equation y=7x+25.
where x represents number of people being served and y represetns number of minutes it takes to prepare a meal.
Number of people can be taken for x variable are 1,2,3,4...
From the given equation if we plug x=0, it gives y=7(0)+25= 0+25=25.
So, fix number of minutes is 25 minutes to prepare a meal.
If we take x=1, that means we are taking 1 extra person and if we plug x=1 in original function, we get y=7(1)+25= 7+25.
So, it is taking 7 extra minute to prepare a meal.
Let us check by adding one more person. For that we need to take 1+1=2 number of person.
On plugging x=2, we get y=7(2) +25 = 14+25 = 7+7+25.
So every time if we add extra person, the time increase by 7 minutes to prepare a meal.
Therefore, Option "C) For every extra person served, the time it takes to prepare a meal increases by 7 minutes." is correct option.
