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Because the mean is the average number. To find the average (or mean), add all numbers and divide by how many numbers you added. Example: 2, 3, 4, 6 Add: 2+2+4+8=16 Divide: 16/4= 4 4 is the mean or provisional average
one has ' prime cost' in front of the word 'sum' and the other has the word 'provisional' in front of 'sum'
Provisional contracts means temporary contracts with a temporary agreement and against the contract the work order is also issued temporarily for a perticular period of time for the interest of the work.
Provisional sum is an amount quoted for an item in a tender document where all of the design information is not fully specified. The provisional sum should be as accurate as possible with the information to hand A variation is an item within a construction project that was not originally specified in the contract tender document and so is a 'variation to contract'.
Two numbers are needed to find a mean.