Tell whether the following is certain to happen, impossible can happen but not certain: The next traffic light seen will be green.

Tell whether the following is certain to happen, impossible can happen but not certain: A tossed coin will land heads up.

Tell whether the following is certain to happen, impossible can happen but not certain: Tomorrow will be a cloudy day.

Tell whether the following is certain to happen, impossible can happen but not certain: you are older today than yesterday.

Tell whether the following is certain to happen, impossible can happen but not certain: A die when tossed shall land up with 8 on top.

Complete the following statements : The probability of an event that is certain to happen is _________ . Such an event is called _________ .

Complete the following statements : (i) CPC Study Package 483 Mathematics CPC Study Package 483 Mathematics probability of an event E + Probability of the event 'not E' = …………… . (ii) The probability of an event that cannot happen is ………..Such an event is called . (iii) The probability of an event that is certain to happen is ............. . Such an event is called. (iv) The sum of the probabilities of all the elementary events of an experiment is ........... (v) The probability of an event is greater than or equal to ........... and less than or equal to ........

Complete the statements: (a) Probability of event E + Probability of event 'not E' = __________. (b) The probability of an event that cannot happen is ___________. Such an event is called__________. (c) The probability of an event thai is certain to happen is __________. Such an event is called________ sure or certain event. (d) The sum of the probabilities of all the elementary events of an experiment is _________. (e) The probability of an event greater than or equal to _________and less than or equal to _________.

Two luminous point sources seperated by a certain distance are at 10 km from an observer. If the aperture of his eyes is 2.5xx10^(-3)m and the wavelength of light used is 500 nm, the distance of seperation between the point sources just seen to be resolved is