for a certain class, the following data table summarizes the amount of sleep of students and whether or not…

for a certain class, the following data table summarizes the amount of sleep of students and whether or not they have an a in the class. what is the probability that a student chosen randomly from the class has an a?\n| | slept more than 6 hours | slept 6 hours or less |\n|--|--|--|\n| has an a | 7 | 2 |\n| does not have an a | 4 | 12 |

for a certain class, the following data table summarizes the amount of sleep of students and whether or not they have an a in the class. what is the probability that a student chosen randomly from the class has an a?\n| | slept more than 6 hours | slept 6 hours or less |\n|--|--|--|\n| has an a | 7 | 2 |\n| does not have an a | 4 | 12 |

Answer

Explanation:

Step1: Calculate total number of students

$7 + 2+4 + 12=25$

Step2: Calculate number of students with an A

$7 + 2 = 9$

Step3: Calculate probability

The probability $P$ that a student has an A is the number of students with an A divided by the total number of students. So $P=\frac{9}{25}= 0.36$

Answer:

$0.36$