The measure of ? summarizes all of the data values in a data set with a ? number

we know that

a measure of centre for a numerical data set summarises all of its values with a single number

while a measure of variation describes how its number varies

so, we will put "centre" in first blank

and "single" in second blank

so, we can write as

The measure of centre summarises all of the data values in a data set with a single number

the answer to your question a or b but i am pretty sure it is b. i hope this : )

step-by-step explanation:

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step-by-step explanation: