28 is the LCM of 4 and 7 as 4*7 = 28
I'm not sure if it will work, but try downloading the Slader app. I hear that many people use it to look up text book answers and stuff like that.
Answer:
Well to find the mean of the above
take £ as sigma
therefore,
mean= £fx/£f
This simply means the sum of all the numbers divided by the number of members
therefore,
10 + 11+12+13+14+15+16+17+18= 126
And the number of figure present on the number line are 9, therefore 126 divided by 9
giving you a result of 14
Therefore the mean of the above numbers is 14.
