Question

20 students were given a test series consisting of 25 the proportion of correct answer is when 15,15,19,17,22,11,21,21,17,21,22,16,22,16,15,17,23,16,21,15 by using z=3

Answer 1

Answer:

first add all the obs then divide by all the n number which is 20 but chck the answr plz