class 11

Math

Algebra

Statistics

If the standard deviation of the numbers $2,3,aand11$ is $3.5,$ then which of the following is true ?

Similar Topics

determinants

matrices

binomial theorem

complex numbers and quadratic equations

sequences and series

$100$ surnames were randomly picked up from a local telephone directory and the frequency distribution of the number of letters in the English alphabets in the surnames was obtained as follows:

Number of letters | $1−4$ | $4−7$ | $7−10$ | $10−13$ | $13−16$ | $16−19$ |

Number of surnames | $6$ | $30$ | $40$ | $16$ | $4$ | $4$ |

Given bellows is the number of units of electricity consumed in a week in a certain locality:

Consumption (in unit) | $65−85$ | $85−105$ | $105−125$ | $125−145$ | $145−165$ | $165−185$ | $185−205$ |

Number of consumers | $4$ | $5$ | $13$ | $20$ | $14$ | $7$ | $4$ |

Find Median value of Electricity Consumption.

A class teacher has the following absentee record of $40$ students of a class for the whole term. Find the mean number of days a student was absent.

Number of days | $0−6$ | $6−10$ | $10−14$ | $14−20$ | $20−28$ | $28−38$ | $38−40$ |

Number of students | $11$ | $10$ | $7$ | $4$ | $4$ | $3$ | $1$ |

From the data given below state which group is more variable $A$ or $B$

Marks | 10-20 | 20-30 | 30-40 | 40-50 | 50-60 | 60-70 | 70-80 |

Group A | 9 | 17 | 32 | 33 | 40 | 10 | 9 |

Group B | 10 | 20 | 30 | 25 | 43 | 15 | 7 |