Calculate the number of ends per inch in a reed of 3/64 stock port

Match the correct Suffix  with the root words :

What is the cumulative frequency up to the class interval 30-40

Range of first twenty positive integers is 

Mean of 89 observations is found to be 32. At the time of computation two item were wrongly taken as 29 and 37 instead of 38 and 28. Find the correct mean.

What is the median of the data 526,265,726,672,625,248,482,252,276,267,284,256