Marla bought one necklace and two bracelets for $67.50. use the following information to determine the amount she paid for each bracelet:

the price of the necklace was $27.
the bracelets were both the same price.

Suppose that sahil knows that 45 people with ages of 18 to 29 voted. without using a calculator, he quickly says then 135 people with ages of 30to 49 voted. is he correct? how might sohil have come up with his answer so quickly?

Scores on a university exam are normally distributed with a mean of 78 and a standard deviation of 8. the professor teaching the class declares that a score of 70 or higher is required for a grade of at least “c.” using the 68-95-99.7 rule, what percentage of students failed to earn a grade of at least “c”?

If p(a) = 0.70 and p(b) = 0.20, then a and b are independent events if