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Margaret [11]
3 years ago
8

The mean of six numbers is 10. When

Mathematics
2 answers:
vivado [14]3 years ago
5 0

Answer:

3

Step-by-step explanation:

If 6 numbers have a mean value of 10, it means that the sum of the numbers divided 6 is equal to 10. This can be expressed as:

x÷6=10

x=60

The new number added will be the 7th number and now the mean is 9. You have to ask what number divided by 7 is equal to 9? This can be expressed as:

y÷7=9

y=63

63-60=3

So the new number added is 3

raketka [301]3 years ago
3 0

Answer:

3

Step-by-step explanation:

Mean is calculated as

mean = \frac{sum}{count}

Given the mean of 6 numbers is 10, then

\frac{sum}{6} = 10 ( multiply both sides by 6 )

sum = 60

When another number x is added then count is 7

\frac{60+x}{7} = 9 ( multiply both sides by 7 )

60 + x = 63 ( subtract 60 from both sides )

x = 3 ← the number added

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