Tina conducted a survey to find the favorite weekend activity of the people in her state. she asked 10 of her neighbors what their favorite weekend activity is. tina concludes that boating is the favorite weekend activity of the people in her state because 70% of her neighbors like to go boating on weekends. use at least two sentences to explain why tina's sample may not be valid. make sure to use facts to support your answer.

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

The krasnapolski is a top-of-the-line hotel in amsterdam, the netherlands. among their many services, they rent bicycles to guests. the bicycle checkout is open 24 hours per day 7 days per week and has 50 bicycles on hand. on average, 10 guests request a bicycle each day, arriving completely randomly at all times of the day during the spring and summer seasons. guests keep bicycles for four days on average, with a standard deviation of two days. how long does a guest on average have to wait for a bike? a. approximately 24 hours b. approximately 0.033 hours c. approximately 4 days d. approximately 47 minutes

If x-1 and x+3 are the factors of x3+10x2+ax+b find a and b