N a test of 4 subjects, Mike gets 96, 60 and 55 in three subjects. If his average (arithmetic mean) mark for all four subjects is 74, what is his fourth mark?

1 Answer
Daniel L.
Dec 21, 2016

The last mark is #85#. See explanation for details.

Explanation:

The mean of scores is their sum divided by their number, so if we write #x# for Mike's last score, then we can write that:

#(96+60+55+x)/4=74#

#(211+x)/4=74#

#211+x=296#

#x=296-211=85#

Answer: Mike's last score is #85# points.

Related questions
Impact of this question
356 views around the world
You can reuse this answer
Creative Commons License