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I'm a bit stuck on this question if anyone can help me?
Last year a new mobile phone company, Sonia, produced and stocked shops with 200,000 of their new phone, Sonia 1. The distribution of the battery times is approx- imately normal. Sonia claims that the mean battery time is 16 hours. If the claim is true, which of the following would be more likely? (a) A random sample of 10 phones having a mean battery time greater than 18 hours or (b) A random sample of 50 phones having a mean battery time greater than 18 hours Justify your answer in no more than five sentences.
Hey! Could anyone help me with this question? It would be much appreciated, thank you!
Find the values of 'x' for which the function f(x)=2x+3+ (18/x-4) is increasing.
A bag contains 3 black counters, 4 red counters and 5 blue counters. A counter is taken at random down the probability that it is a black or red counter.