in a class of 50 people 30 said that they spend 2 hours playing video games if was a true sample how many students out of a 800 in the school would say they also spend more than 2 hours playing video games​

480

Step-by-step explanation:

0.02

step-by-step explanation:

time of 9 192 631 770 periods of the radiation corresponding to the transition between the 2 hyperfine levels of the ground state of the caesium 133 atom at 0 k (but other seconds are sometimes used in astronomy)