The weights (in kg) of 20 boys in a class are given. Prepare a frequency distribution table and find the range of the data.

The unique weights are $40, 42, 44, 46, 48, 50$.

• $40 \text{ kg}$: 1
• $42 \text{ kg}$: 3
• $44 \text{ kg}$: 5
• $46 \text{ kg}$: 4
• $48 \text{ kg}$: 4
• $50 \text{ kg}$: 3 Total count: $1+3+5+4+4+3 = 20$, which matches the number of boys.

Here is the frequency distribution table:

• What is the range of the data?

Maximum weight $= 50 \text{ kg}$
Minimum weight $= 40 \text{ kg}$

The range of the data is $\boxed{10 \text{ kg}}$.

49. During a rainy season, students of a class made a count of the umbrellas, which students brought to the class on Monday, Tuesday, Wednesday, Thursday, Friday and Saturday. The count was as under:
Monday: 25
Tuesday: 20
Wednesday: 10
Thursday: 20
Friday: 15
Saturday: 30

• Represent this information through a pictograph.

The numbers are $25, 20, 10, 20, 15, 30$. All are multiples of 5.
Let's use the symbol ☂️ to represent 5 umbrellas.
Scale: ☂️ $= 5$ umbrellas

• Monday: $25 \div 5 = 5$ umbrellas ☂️☂️☂️☂️☂️
• Tuesday: $20 \div 5 = 4$ umbrellas ☂️☂️☂️☂️
• Wednesday: $10 \div 5 = 2$ umbrellas ☂️☂️
• Thursday: $20 \div 5 = 4$ umbrellas ☂️☂️☂️☂️
• Friday: $15 \div 5 = 3$ umbrellas ☂️☂️☂️
• Saturday: $30 \div 5 = 6$ umbrellas ☂️☂️☂️☂️☂️☂️

Here is the pictograph:

50. The following are the details of number of students present in a class of 30 during a week. Represent it by a pictograph.

• Represent it by a pictograph.

The numbers are $24, 26, 28, 30, 29, 22$. These numbers include odd and even values.
Let's use the symbol 🧍 to represent 2 students. For odd numbers, we will use a half symbol.
Scale: 🧍 $= 2$ students, and 🚹 $= 1$ student (half symbol)

• Monday: $24 \div 2 = 12$ students 🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍
• Tuesday: $26 \div 2 = 13$ students 🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍
• Wednesday: $28 \div 2 = 14$ students 🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍
• Thursday: $30 \div 2 = 15$ students 🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍
• Friday: $29 = 14 \times 2 + 1$. So, 14 full symbols and 1 half symbol 🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🚹
• Saturday: $22 \div 2 = 11$ students 🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍🧍

Here is the pictograph: