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The monthly pocket money of a group of students has a… | StemPy Lab
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The monthly pocket money of a group of students has a mean of 20 coins and a standard deviation of 4 coins. A grandparent gives every student 7 more coins. What are the new mean and the new standard deviation?
Mathematics
Easy
High School (11–12)
Statistics and Probability › Statistics
AP
A-Level
IB
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StemPy Lab
The monthly pocket money of a group of students has a mean of
20
20
20
coins and a standard deviation of
4
4
4
coins. A grandparent gives every student
7
7
7
more coins. What are the new mean and the new standard deviation?
Mean
27
27
27
coins, standard deviation
28
28
28
coins
Mean
27
27
27
coins, standard deviation
11
11
11
coins
Mean
20
20
20
coins, standard deviation
4
4
4
coins
Mean
27
27
27
coins, standard deviation
4
4
4
coins
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← A statistician wants to compare how steady two data sets are when their means are very different and their units differ. Which expression gives the coefficient of variation of a data set with mean x and standard deviation σ?
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