Please help with my maths Answer both questions ONLY ANSWER IF YOU PLAN ON DOING BOTH
please and thank you

Suppose there are 10 five and six-year-old attending a birthday party. when a 30 year old mother walks into the room with an infant in her arms, what happens to the mean age in the room? what happens to the standard deviation of ages in the room? a. the mean and standard deviation of both change. b. the meaning will change, but the standard deviation will stay approximately the same. c. i mean will stay approximately the same, but the standard deviation will change. d. the mean and standard deviation will both stay approximately the same.

What is the lcm of 16 and 40 ? 24 and 40 ?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?