Answer: d
Step-by-step explanation:
The probability of not being purple is the probability of the three other colors. Suppose the number of purple marbles is x. Then we have 20+30+40+x = 90 + x marbles. Then the probability of not being purple is 90/(90+x). If this fraction can have a lowest term for some value of x, then the numerator of this lowest term must be a factor of 90.
Checking through the options, only option D has a non-factor of 90 as its numerator.
Answer:
x=2
Step-by-step explanation:
x+2=4
x=2
Answer:
you have an odd number, divide by 2 and round up to get the position of the median number.
Step-by-step explanation:
you have an even number, divide by 2. Go to the number in that position and average it with the number in the next higher position to get the median.
Answer:
don't search link
Step-by-step explanation:
