In addition to the other posters responses, you do need to know your Breed's average hip score so you can compare your pup's parents hip scores with the breed average. If you have been given a copy of the parent's Hip & Elbow scoring report, it should contain the breed average, and then all you need to do is add the right and left hip scores together for each parent (i.e. lets say the mum's score is 4 for right hip & 5 for left hip (4/5) then the total is 9 for mum so you then compare this against the breed average for your breed to see how the mum's score compares against the breed total. You do the same thing for the dad's scores. Whilst the lower the better, particularly lower than the breed average, you need to also be mindful that it is better to have fairly equal scores for each hip i.e. 4/4 is better than say 1/6 or 1/5 as even though the total of 1/6 or 1/5 is lower than the total of 4/4, a 4/4 score indicates both hips are the same, whereas the 1/6 or 1/5 indicates uneven hips with the left hip having the higher score indicating a problem in the left hip.
If you are concerned with the hip scores discuss them with your breeder as whilst most breeders aim to breed dogs with low hip/elbow scores, they do also breed dogs that may be close to/equal to the breed average or even slightly over it as they also consider other important factors when breeding a dog, like temperament which is extremely important. A puppy buyer that is not knowledgeable about the breed may consider the breed average hip scores to be quite high, but it really depends on the breed and the potential for joint problems. This is particularly so for large and giant breeds. My breed is the Labrador Retriever and the and the breed average hip scores for Labs is 12, so it is quite reasonable for Lab breeders to breed Labs with hip scores up to 12, particularly if they have an excellent pedigree/excellent lines. Breeders have to take many things into consideration when determining which dogs to breed and just because a dog has low hip scores, it may not be a great example of the breed as it may not have the correct breed temperament and or may not be physically close enough to the breed standard for the breeder to breed it.
My breed of choice is prone to joint problems, both hip and elbows and whilst I don't have an issue with hip scores up to the average breed score of 12 for Labs, I am more particular on the elbows and expect elbow scores of 0 in both parents as I believe elbows to be more of a problem than hips for my breed.
If you really want to learn as much as possible about hip/elbow scoring, you should get a copy of your pup's parent's Hip & Elbow Scoring Report/Certificate from the Breeder if you don't have them already as this should list the individual scores for each area of the hip joint that the Radiologists score and there are 9 areas that are individually hip scored/graded. You can then follow the link above that one of the other posters gave you to Veterinary Imaging Associates Veterinary Imaging Associates
who explain on their website each of the areas that are scored during the hip scoring and it also gives an explanation of each of the scores for each of those areas. Elbow Scoring is a lot less complicated than hip scoring as the elbow joint only is graded, rather than different areas of the elbow, so a dog receives one score only for each elbow (0 or 1 or 2 or 3).