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DS-1000 / 346 / I need to do some analysis on a large dataset from a hydrolgeology field work. I…

Problem

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Problem:
I need to do some analysis on a large dataset from a hydrolgeology field work. I am using NumPy. I want to know how I can:
1.	multiply e.g. the row-th row of my array by a number (e.g. 5.2). And then
2.	calculate the cumulative sum of the numbers in that row.
As I mentioned I only want to work on a specific row and not the whole array. The result should be an 1-d array --- the cumulative sum.
A:
<code>
import numpy as np
a = np.random.rand(8, 5)
row = 2
multiply_number = 5.2
</code>
result = ... # put solution in this variable
BEGIN SOLUTION
<code>

library

Numpy

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Source and history

upstream_id / Original problem ID
346
task_id
e69bf9e9-a8a1-531b-81d1-0bab17cd44f5
task_key
default--test--346
task_revision_id
1
config / split
default / test

Official source

initial import