Python Summer Internship Quiz -10

How do you calculate the mean of a NumPy array arr?

• a) arr.mean()

• b) np.mean(arr)

• c) arr.mean(axis=0)

• d) Both a and b

Which of the following is not true about NumPy?

• It is a cross-platform module

• It stands for Number Python

• We need to install this module before using it

• None of the above

Find the output of the below code.

a = np.array([[[1,2,3],[4,5,6]]])

print(a.ndim)

• 1

• (1,3)

• 3

• (3,1)

What does the function itemsize() return?

• It returns the size of the array

• It returns the number of elements in the array

• It returns the byte size of each element of the array

• None of the above

Find the output of the below code.

a = np.array([[1,2,3],[4,5,6]])

then what is a[1,2]

• 6

• 5

• 2

• TypeError

What is the correct way to reshape a NumPy array arr to a shape (2, 3)?

• arr.reshape(3, 2)

• arr.reshape((2, 3))

• np.reshape(arr, (2, 3))

• Both b and c

What is the result of np.array([1, 2, 3]) + np.array([1, 2, 3])?

• [2, 4, 6, 4]

• [2, 4, 6]

• Error

• [1, 2, 3, 4, 1, 2, 3]

How do you read a CSV file into a pandas DataFrame?

• pd.read_csv("file.csv")

• pd.load_csv("file.csv")

• pd.read("file.csv")

• pd.load("file.csv")

How do you get the summary statistics of a DataFrame?

• df.stats()

• df.describe()

• df.summary()

• df.statistics()

What is the correct way to select a column named "age" from a DataFrame df?

• None

• df['age']

• df.loc['age']

• Both a and b