FAQ: Introduction to Statistics with NumPy - NumPy and Mean

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This community-built FAQ covers the “NumPy and Mean” exercise from the lesson “Introduction to Statistics with NumPy”.

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This exercise can be found in the following Codecademy content:

Data Science

Introduction to Statistics with NumPy

FAQs on the exercise NumPy and Mean

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2

I’m lost as to how to answer Question #3 for this exercise:
"The boss says that we should increase what we stock, but only if the store’s average sales are greater than 7 bottles per week.

Save the store dataset variable name that fits this description to the variable best_seller ."

How do you associate a store name with the value where the store average is greater than 7 in NumPy? i’m so stuck.

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best_seller = store_two

1 Like
4

Code challenge:
Write a function that will automatically detect best seller.

3 Likes
5

I agree, the question is misleading it states:

Save the store dataset variable name that fits this description to the variable best_seller .

That to me indicates the actual name of the variable, not the array of data. Remove the text “variable name” from the instructions.

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actually still i am worry how to write the code to answer that question automatically

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if store_one_avg > 7:
  best_seller = store_one
  print('Best seller is store one')
  
if store_two_avg > 7:
  best_seller = store_two
  print('Best seller is store two')
  
if store_three_avg > 7:
  best_seller = store_three
  print('Best seller is store three')

i;'m sure there's a better why to write it using a loop, but i'm pretty new. The question asked for stores that have an average of more than 7, so that might be more than one.
mj
1 Like
8 
for x in ['a', 'b', 'c']:
    if condition:
        print("Condition fulfilled by {}".format(x))
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> store_dataset = [[store_one, store_one_avg], [store_two, store_two_avg], [store_three, store_three_avg]]
> 
> for i in store_dataset:
>   if i[-1] > 7.0:
>     best_seller = i[0]
2 Likes
10

My solution is

best_seller = ([store_one,store_two,store_three][[store_one_avg,store_two_avg,store_three_avg]>7])
2 Likes
11

The wording of Question 3 is pretty confusing. It is difficult to interpret what you want us to do

2 Likes
12

Save the store dataset variable name that fits this description to the variable best_seller .

That is horribly worded. That can mean so many things when you google dataset but one thing you wont find is that it was meant to be the array/list.

In short, dataset makes reading and writing data in databases as simple as reading and writing JSON files. To install dataset, fetch it with pip:

13

This is a very nice approach! Thank you!