Tammy conducted a survey to find the favorite subject of the students at her school. she asked 25 students from her math class what their favorite subject is. tammy concludes that math is the favorite subject of the students at her school because 60% of the students in her class like math. use at least two sentences to explain why tammy's sample may not be valid. make sure to use facts to support your answer.

Someone me! if you’re smart you can solve this!

If f(x)=x+7 and g(x)=1/x what is (fog)(x)

The management of a supermarket wants to adopt a new promotional policy of giving a free gift to every customer who spends more than a certain amount per visit at this supermarket. the expectation of the management is that after this promotional policy is advertised, the expenditures for all customers at this supermarket will be normally distributed with a mean of $95 and a standard deviation of $20. if the management wants to give free gifts to at most 10% of the customers, what should the amount be above which a customer would receive a free gift?