Complete the table. Class intervals Length of intervals Mid-values Class Limits Class Boundaries Lower Upper Lower Upper 20 - 24 25 - 29 30 - 34 35 - 39 40 - 44 45 - 49

The difference between the lower limits (or upper limits) of any two consecutive class intervals is called the length of the class interval. The average of the upper and lower limits of a class interval is called its mid-value of the class interval. The endpoints of a class interval are called its class limits. The average of the upper-class limit of a class interval and the lower class limit of the next higher class interval is called the class boundary. Class intervals Length of intervals Mid-values Class Limits Class Boundaries Lower Upper Lower Upper 20 - 24 5 22 20 24 19 . 5 24 . 5 25 - 29 5 27 25 29 24 . 5 29 . 5 30 - 34 5 32 30 34 29 . 5 34 . 5 35 - 39 5 37 35 39 34 . 5 39 . 5 40 - 44 5 42 40 44 39 . 5 44 . 5 45 - 49 5 47 45 49 44 . 5 49 . 5

E M B I B E

ICSE Skills In Mathematics>Statistics>Chapter 33 - Statistics>MASTERY TEST-7

V K Raman and S N Sharma Solutions for Exercise 3: MASTERY TEST-7

Author:V K Raman & S N Sharma

V K Raman Mathematics Solutions for Exercise - V K Raman and S N Sharma Solutions for Exercise 3: MASTERY TEST-7

Attempt the practice questions from Exercise 3: MASTERY TEST-7 with hints and solutions to strengthen your understanding. ICSE Skills In Mathematics solutions are prepared by Experienced Embibe Experts.

Questions from V K Raman and S N Sharma Solutions for Exercise 3: MASTERY TEST-7 with Hints & Solutions

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 3

Write down the mode: $14, 27, 19, 33, 28, 19, 41, 33$

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 4

The marks of 30 students in a class are given below:

$17, 29, 46, 32, 18 31, 40, 24, 42, 25, 9, 20, 11, 31, 26, 28, 8, 14, 31, 22, 14, 28, 7, 30, 40, 27, 31, 36, 27, 15$

Make a frequency table, showing the tally marks.

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 5

The mean of $8, (x - 2), 17, (x + 3), 20, 24, (2 x - 4), 22, 7$ and $15$ is $17$ . Find $x$ .

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 6

Calculate the mean.

Height in $cm$	$70 - 75$	$75 - 80$	$80 - 85$	$85 - 90$	$90 - 95$	$95 - 100$
No. of students	$2$	$5$	$6$	$8$	$7$	$2$

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 7

Calculate the mean.

Weight in $kg$	$41 - 45$	$46 - 50$	$51 - 55$	$56 - 60$	$61 - 65$	$66 - 70$
No. of students	$4$	$9$	$12$	$15$	$7$	$3$

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 8

Complete the table.

Class intervals	Length of intervals	Mid-values	Class Limits		Class Boundaries
Class intervals	Length of intervals	Mid-values	Lower	Upper	Lower	Upper
$20 - 24$
$25 - 29$
$30 - 34$
$35 - 39$
$40 - 44$
$45 - 49$

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 9

A family spent $₹ 30, 000$ as follows: Rent $₹ 8, 000$ , Food- $₹ 12, 000$ , Fuel - $₹ 5, 000$ and Other items - $₹ 5, 000$ .

Draw a pie diagram for the above data, If the sector angle for food is $k °$ , then find value of $k$

EASY

8th ICSE

IMPORTANT

ICSE Skills In Mathematics>Chapter 33 - Statistics>MASTERY TEST-7>Q 10

The weight of $10$ students were recorded as $31 kg, 32 kg, 33 kg, 34 kg, 35 kg, 35 kg, 37 kg, 38 kg, 39 kg$ and $40 kg$ . It was found that the weighing machine was faulty and that it showed the weight by increasing it with $2 kg$ every time. Calculate the correct mean weight of the students.

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