Standard Deviation of Grouped Data

Given the following grouped data, calculate the mean: | Class Interval | Frequency | |----------------|------------| | 10-20 | 5 | | 20-30 | 8 | | 30-40 | 12 | | 40-50 | 6 |

• 30

• 32

• 28

• 34

Given the following grouped data, calculate the standard deviation: | Class Interval | Frequency | |----------------|------------| | 10-20 | 3 | | 20-30 | 7 | | 30-40 | 9 | | 40-50 | 6 |

• 10

• 12

• 11

• 9

Given the following grouped data, calculate the mean: | Class Interval | Frequency | |----------------|------------| | 0-10 | 2 | | 10-20 | 4 | | 20-30 | 6 | | 30-40 | 8 |

• 20

• 25

• 15

• 30

Given the following grouped data, calculate the standard deviation: | Class Interval | Frequency | |----------------|------------| | 0-10 | 4 | | 10-20 | 6 | | 20-30 | 8 | | 30-40 | 10 |

• 8

• 9

• 10

• 11

For the grouped data below, what is the mid-point of the class interval 30-40? | Class Interval | Frequency | |----------------|------------| | 10-20 | 5 | | 20-30 | 8 | | 30-40 | 12 | | 40-50 | 6 |

• 30

• 35

• 40

• 45

Given the following grouped data, calculate the mean: | Class Interval | Frequency | |----------------|------------| | 5-15 | 3 | | 15-25 | 5 | | 25-35 | 7 | | 35-45 | 9 |

• 25

• 30

• 20

• 35

Given the following grouped data, calculate the standard deviation: | Class Interval | Frequency | |----------------|------------| | 5-15 | 5 | | 15-25 | 7 | | 25-35 | 9 | | 35-45 | 11 |

• 9

• 10

• 11

• 12

Given the following grouped data, calculate the standard deviation: | Class Interval | Frequency | |----------------|------------| | 0-10 | 4 | | 10-20 | 6 | | 20-30 | 8 | | 30-40 | 10 |

• 8

• 9

• 10

• 11

What is the standard deviation of the data?

• 0.88 cm

• 0.90 cm

• 0.94 cm

• 1.02 cm

What is the midpoint of the modal class?

• 19.5

• 20.5

• 21

• 24.5