Answer:
1000?
Step-by-step explanation:
1200+480+920 =2600
3600-2600 = 1000?
maybe
Unless this is some perplexed kind of math, how can you solve the variables when there is only one number to go from?
Is there a 'not enough information' answer choice
Answer:
A third group that does not use a cell phone before bedtime
Step-by-step explanation:
Both groups have the use of a cellphone before bedtime, and the amount used would affect their time to fall asleep, but another group is needed that doesn't use a cellphone to calculate the effect of it not being used and seeing the results.
Answer:
if we take ratio then answer is option D