Question

the given table
marks number of students
0-20 7
20-30 10
30-40 10
40-50 20
50-60 20
60-70 15
70-above 8
total 90

(a)find the probability that student obtained less than 40per. in math test
(b) find probability that student obtained marks 50or above
(c) find probability that student obtained marks 60 or above ​

Answer 1

Answer:

the probability of math test Is

=20%

the probability of 50 above is

=45%