There were 20 students in a class here are their marks of a physics and a math test.
Physics marks- 3,13,14,14,20,26,26,28,29,32,34,36,37,42,47,47,48,54,56,59.
Math marks- 2,12,12,24,26,26,26,27,27,28,30,32,34,40,42,44,49,50,54,54.
If a dictinction is awarded to scores that are more than 50 marks, find the probability that a student chosen at random recieves at least one dictinction grade.
explain your answer please (:
2006-07-01 21:37:48 · 7 answers · asked by rain-shadow 2 in Education & Reference ➔ Homework Help
UGH..you can't see the rest of the numbers.. you'll have to hover over them to read the rest
2006-07-01 21:45:49 · update #1
zero...
None of the totals add up over 50...not even close.
2006-07-01 21:40:27 · answer #1 · answered by Dave 6 · 0⤊ 0⤋
I don't really understand the proper question, so i made 2 solutions:
Case 1: The student need more than 50 point in math or in physics, or in both of them.
More than 50 in ph: 3 students, 3/20=0.15, it's 15%.
More than 50 in math: 2 students: 10%.
Probability of more than 50 in both: 0.15*0.10=0.015, its 1,5%.
The final probability is: 15+10-1,5=23,5%.
Idea: add the groups and substract the common part of them,
becouse you have counted them twice.
Case 2: the student need a sum of 50 point in the two:
All possibilties: 20*20=400.
Good possibilities:
3 is good with 48, 54, 56, 59, thats 4.
13 is good with 42, 47, 47, 48, 54, 56, 59, thats 7.
Continue this way and add them: 308.
Good divided by all: 308/400=0.77, its 77%.
I hope that helps.
2006-07-02 05:23:00 · answer #2 · answered by San-diel 2 · 0⤊ 0⤋
Hover over them?
2006-07-02 10:32:08 · answer #3 · answered by quickster94 3 · 0⤊ 0⤋
Naw, do your own homework for once.
2006-07-02 04:41:08 · answer #4 · answered by Anonymous · 0⤊ 0⤋
Are u kiding
2006-07-02 04:44:14 · answer #5 · answered by kingdarkangle 1 · 0⤊ 0⤋
yep
2006-07-02 04:40:50 · answer #6 · answered by _ 6 · 0⤊ 0⤋
add all those terms whose sum is greater than 50...thats your naswer........lol...wow...they do.....like 26+26,26+27,26+27,26+28.....wow.......
2006-07-02 04:40:02 · answer #7 · answered by wha_shizzle_is_dizzlin 2 · 0⤊ 0⤋