Perfume is sold in two different sizes of bottle
the 80ml bottle is priced at £55
the 50ml bottle is usually priced at £45, but is on special offer. If you buy one 50ml bottle of perfume, you can get a second half price.
by calculating the price per ml, determine which offers the best value for money, the 80ml bottle or two 50ml bottles?

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Given the following sampling distribution of one mean with a sample size 49, from a normally distributed population,find the population standard deviation, o.79828588912497

The swimming pool is open when the high temperature is higher than 20∘c. lainey tried to swim on monday and thursday (which was 3 days later). the pool was open on monday, but it was closed on thursday. the high temperature was 30∘c on monday, but decreased at a constant rate in the next 3 days. write an inequality to determine the rate of temperature decrease in degrees celsius per day, d, from monday to thursday.