Answer:
a
Step-by-step explanation:
Answer: 23
Step-by-step explanation:Since mean is the amount of everything together and divided by the number there is, 15 times 5 numbers= 75 and 75-(12+24+16+18)=x.
Therefore x=23
y = 5s, s = 2
y = 5(2)
y = 10 is the solution