Answered

The mean of 15 numbers is 12. an extra number is included and the mean increases to 13. what is the extra number?

Sagot :

HarukiShigapid

Solution:

Find the total of the 15 numbers:

[tex]\tt{Mean = 12}[/tex]

[tex]\tt{Total = 15 \times 12 = 180}[/tex]

The new total number will increase from 15 to 16

Find the total of the 16 numbers:

[tex]\tt{Man = 13}[/tex]

[tex]\tt{Total = 16 \times 13 = 208}[/tex]

Find the extra number:

[tex]\tt{Extra \: Number = 208 - 180 = 28}[/tex]

Answer:

The Extra Number is 28

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