Quiz1 SHU Solved
19/11/2023, 12:57 AM
Quiz 1: Dataset - Laptops Pricing
Estimated time needed: 30 minutes
In this quiz, you will practice the process of loading and drawing basic insights on a
dataset as learnt through the course. You are being provided with a fresh dataset on
'Laptop Pricing' which will be used for all the practice labs throughout this quiz.
Objectives
After completing this lab you will be able to:
Import a dataset from a CSV file to a Pandas dataframe
Develop some basic insights about the dataset
Extract and interpret descriptive statistics of the dataset series
Setup
For this lab, we will be using the following libraries:
[ pandas ] for managing the data.
[ numpy ] for mathematical operations.
Importing Required Libraries
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Quiz1 SHU Solved
19/11/2023, 12:57 AM
In [29]: import pandas as pd
import numpy as np
df=pd.read_csv("./laptops.csv")
# create headers list
headers = ["Manufacturer", "Category", "Screen", "GPU", "OS", "CPU_core", "Scre
df.columns = headers
The data set to be used has been imported.
Task #1:
Print the first 7 entries of the dataset to confirm loading. [1 mark]
In [30]: # Write your code below and press Shift+Enter to execute.
df.head(7)
Manufacturer
Category
Screen
GPU
OS
CPU_core
Screen_Size_inch
CPU_frequency
0
Dell
3
Full HD
1
1
3
39.624
2.0
1
Dell
3
Full HD
1
1
7
39.624
2.7
2
Dell
4
IPS
Panel
2
1
5
33.782
1.6
3
HP
4
Full HD
2
1
7
39.624
1.8
4
Dell
3
Full HD
1
1
5
39.624
1.6
5
HP
3
Full HD
3
1
5
39.624
1.6
6
Acer
3
IPS
Panel
2
1
5
38.1
1.6
Out[30]:
Task #2:
What is the number of rows and columns in the data? [1 mark]
In [31]: df.shape
Out[31]:
(237, 12)
Write your answer here
237 by 12
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Quiz1 SHU Solved
19/11/2023, 12:57 AM
Task #3:
What is the screen size of the entry number 17 of this data? [1 mark]
In [32]: # Write your code below and press Shift+Enter to execute.
df.loc[16]
Out[32]:
Manufacturer
Dell
Category
3
Screen
Full HD
GPU
1
OS
1
CPU_core
7
Screen_Size_inch
39.624
CPU_frequency
1.8
RAM_GB
8
Storage_GB_SSD
256
Weight_kg
2.2
Price
1105
Name: 16, dtype: object
Write your answer here
39.624
Task #4:
What is the average price of all Dell laptops in the data set? [2 marks]
In [33]: # Write your code below and press Shift+Enter to execute.
df.groupby('Manufacturer')['Price'].mean()
Out[33]:
Manufacturer
Acer
1072.111111
Asus
1327.111111
Dell
1495.084507
HP
1399.285714
Huawei
1714.000000
Lenovo
1493.096154
MSI
1452.750000
Razer
3301.000000
Samsung
2107.400000
Toshiba
1703.882353
Xiaomi
1188.000000
Name: Price, dtype: float64
Write you answer here
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Quiz1 SHU Solved
19/11/2023, 12:57 AM
1495.084507
Task #5:
How many laptops of brand Toshiba does this store have? [2 mark]
In [34]: # Write your code below and press Shift+Enter to execute.
print(df.groupby('Manufacturer')['Price'].nunique())
Manufacturer
Acer
18
Asus
17
Dell
65
HP
45
Huawei
1
Lenovo
49
MSI
4
Razer
1
Samsung
5
Toshiba
16
Xiaomi
1
Name: Price, dtype: int64
Write your answer here
16
Task #5:
Which Brand has the most expensive laptop in the dataset? [2 mark]
In [35]: print(df.groupby('Manufacturer')['Price'].max())
Manufacturer
Acer
1650
Asus
3810
Dell
3665
HP
3073
Huawei
1714
Lenovo
3810
MSI
1714
Razer
3301
Samsung
2349
Toshiba
2509
Xiaomi
1188
Name: Price, dtype: int64
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Write your answer here
Asus
Task 6:
How many laptops have a 4 GB ram? [1 mark]
In [36]: df.groupby('RAM_GB')['Price'].nunique()
Out[36]:
RAM_GB
4
29
6
6
8
155
12
1
16
13
Name: Price, dtype: int64
Write your answer here
29
THE END
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