In a test, the 10 students in group 1 get a mean score of 43%.
the 15 students in group 2 get a mean score of 57%.
hank says, " the mean score for all 25 students is 50%."
what mistake has hank made?


what is the correct mean score for all 25 students?

answer: -2+√x,-2-√x

i hope this , i don't know if you're looking for a pair or not.

answer: first option i.e. 'a' is correct.

step-by-step explanation:

since we have given that

number of minutes to wrap a small gift box = 4 minutes

we need to find the number of gifts to be wrapped in 5 minutes

since there is a direct variation, as the number of minutes will increase with   number of gifts to be wrapped.

so, let the number of gifts to be wrapped in 5 minutes be x.

so, it becomes,

hence, first option 'a'   is correct.