Question

The variance and mean of the scores in five rounds of golf is 25 and 64 respectively .what is the standard deviation ?

Answer 1

Answer:

Step-by-step explanation:

To find the standard deviation of a set of numbers, first find the mean (average) of the set of numbers:  

60+75+80+75+705=72

Second, for each number in the set, subtract the mean and square the result:

(60−72)2+(75−72)2+(80−72)2+(75−72)2+(70−72)2=230.  

Then add all of the squares together and find the mean (average) of the squares, like this:  

2305=46  

Finally, take the square root of the second mean:  

46−−√=6.8.