Answer:
median=75.5
mode=76
mean=453/6
mean=75.5
Step-by-step explanation:
Answer:
30
Step-by-step explanation:
let number of questions in the test be x
9 of the first 10 questions are correct
so only x-10 questions remain
3/10 of the (x-10) = 3/10(x-10) questions are correct
scored 50% for the whole test
so only half of x = x/2 questions are correct
combining the above:
9+3/10(x-10) = x/2
9+3/10x-3=x/2
9-3=(1/2-3/10)x
1/5x=6
x=30
100/12=8⅓
multiply the other numbers by 8⅓ to get
15*8⅓=125
21*8⅓=175
the lengths are 100,125,175