Joe takes part in math competitions. a particular contest consists of 25 multiple-choice questions, and each question has 5 possible answers. it awards 6 points for each correct answer, 1.5 points for each answer left blank, and 0 points for incorrect answers. joe is sure of 12 of his answers. he ruled out 2 choices before guessing on 4 of the other questions and randomly guessed on the 9 remaining problems. what is his expected score?
a) 69.2
b) 90.8
c) 97.2

solution:

total number of question in the competition= 25

marks for each correct answer= 6 points

marks for question left blank= 1.5

marks for incorrect answers=0

number of correct answers by joe= 12

so, marks obtained for correct answers= 12 × 6=72

as, joe guessed   4 of the other questions and randomly guessed on the 9 remaining problems.

so, we are not sure whether how many questions joe has done correctly or incorrectly.

but points awarded for correct as well as incorrect answer is multiple of 0.5.

so, total marks obtained must be also multiple of 0.5.

so, none of the option from (a) to (c) is true.

90.8 is the answer, i guessed and got it correct

the camry sales+accord sale=828,000. to make it so the two numbers are 18 thousand apart and still equal 828,000, you first need to find out what half of 828,000 is. 828,000/2=414,000. for the two numbers to equal 828,000, you have to add the same amount as you subtract from the middle. in this case, the number is 9,000 because it's half of 18,000. to equal 828,000, you have to add 9,000 to 414,000 for the camry and subtract 9,000 from 414,000 for the accord. 414,000+9,000=423,000.

414,000-9,000=405,000.

423,000+405,000=828,000.

423,000-405,000=18,

hope it