Finding Standard Deviation from a Frequency Distribution. In Exercises,find the standard deviation of sample data summarized in a frequency distribution table by using the formula befaw, where x represents the class midpoint, f represents the class frequency, and n represents the total number ofsamph values. Aho, compare the computed standard deviations to these standard deviations obtained by using Formula 3-4 with the original list of data values: 13.4.

Verbal IQ Score of Subject Exposed to Lead |
Frequency |

50–59 |
4 |

60–69 |
10 |

70–79 |
25 |

80–89 |
43 |

90–99 |
26 |

100–109 |
8 |

110–119 |
3 |

120–129 |
2 |

Solution 39BSC

Step 1 of 3</p>

From the given information, the frequency distribution of Verbal IQ score of subject exposed to lead is

Verbal IQ Score of Subject Exposed to Lead |
Frequency |

50 – 59 |
4 |

60 – 69 |
10 |

70 – 79 |
25 |

80 – 89 |
43 |

90 – 99 |
26 |

100 – 109 |
8 |

110 – 119 |
3 |

120 – 129 |
2 |