In a marketing study, 60 consumers were asked to select the best digital music player from the iPod

the iRiverthe Zunethe Zenand the Magic Star MP3. To summarize the consumer responses with a frequency table, how many classes would the frequency table have?

classes

A student is taking two courses, history and math. The probability the student will pass the history course is 0.57, and the probability of passing the math course is 0.74. The probability of passing both is 0.42.

What is the probability of passing at least one?(Round the final answer to 2 decimal places.)

Probability