It is just as likely to rain tomorrow as it is to rain the day after tomorrow.
In a school, there will be two people who share a birthday.
It depends how big the school is if there is more than 400 probably.
In a school, it will be someone's birthday every day.
If the school has more than 600 people yes.
A randomly selected person from London will live to a greater age than a randomly selected person from Calcutta.
No
If everyone in the class rolled two dice until someone threw a double six, there would be one winner.
Yes
If I roll a die 100 times, I will get about the same number of 1s as 6s.
Yes
If I flip a fair coin 20 times, I will get 10 heads.
Yes its a fair coin
The mean, median and mode of a set of numbers can't all be the same.
Yes
The mean cannot be less than both the median and the mode.
No
Half of the students taking a test score less than the average mark.
No
Nobody scores higher than the average mark in a test.
No
In a game where you can only score an even number of points (0, 2, 10 or 50), the average score over a series of games must be an even number.
Yes
Could you adapt any of the statements that are sometimes true to make them always or never true?
Yes