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Posted by **Tricia** on Sunday, April 15, 2012 at 7:43am.

- math -
**Bosnian**, Sunday, April 15, 2012 at 7:53amMean score of tests :

( x1 + x2 + x3 + x4 + x5 ) / 5 = 88 Multiply both sides by 5

x1 + x2 + x3 + x4 + x5 = 88 * 5

x1 + x2 + x3 + x4 + x5 = 440

Mean score of six tests :

( x1 + x2 + x3 + 4 + x5 + x6 ) / 6 = 80

[ ( x1 + x2 + x3 + 4 + x5 ) + x6 ] / 6 = 80

( 440 + x6 ) / 6 = 80 Multiply both sides by 6

440 + x6 = 80 * 6

440 + x6 =480

x6 = 480 - 440

x6 = 60

- math -
**Bosnian**, Sunday, April 15, 2012 at 7:54am( x1 + x2 + x3 + x4 + x5 + x6 ) / 6 = 80

- math -
**Bosnian**, Sunday, April 15, 2012 at 7:55amx6 = 480 - 440

x6 = 40

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