Hi,

Please help me solve this question.

Thank you so much.

The cumulative frequency table below shows the length of time that 30 students spent text messaging on a weekend.

Minutes Used |
Cumulative Frequency |

31-40 |
2 |

31-50 |
5 |

31-60 |
10 |

31-70 |
19 |

31-80 |
30 |

Which 10-minute interval contains the first quartile?

(1) 31–40

(2) 41–50

(3) 51–60

(4) 61–70