How should I practice Transaction Amount Mean and Standard Deviation?

Start by reading the full statement, solve the visible examples, then compare the pattern against related Mastercard phone screen problems in FastPrep.

Is Transaction Amount Mean and Standard Deviation associated with Mastercard?

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Transaction Amount Mean and Standard Deviation

Mastercard● EasyFULLTIMEPHONE SCREEN

Problem statement

Calculate the arithmetic mean and population standard deviation of all transaction amounts.

Return two rows in this exact order: mean, then population_stddev. Round both values to two decimal places using ordinary half-up rounding.

Table schema

MySQLPostgreSQLPandas

Use the same input data with any supported language. Open the Schema tab in the editor to see the generated SQL setup or Pandas DataFrames.

transactions

Column	Type	Nullable	Description
transaction_idPK	Integer	No	—
transaction_amount	Decimal	No	—

Expected result

Your query or function must return these columns.

Column	Type	Nullable	Description
metric	Text	No	—
metric_value	Decimal	No	—

Row order: must match exactly. Numeric tolerance: 0.001.

Constraints

At least one transaction is present.
Use population standard deviation, dividing variance by the number of transactions.
Use exact decimal input values and round only final results.