计算器怎么按log2

问题如下：

An insurance company specializing in inexperienced drivers is building a decision-tree model to classify drivers that it has previously insured as to whether they made a claim or not in their first year as policyholders. They have the following data on whether a claim was made (“Claim_made”) and two features (for the label and the features, in each case, “yes” = 1 and “no” = 0): whether the policyholder is a car owner and on whether they have a college degree:

Calculate the “base entropy” of the Claims_made series.

选项：

A.

0.40

B.

0.60

C.

0.843

D.

0.971

解释：

The base entropy is the entropy of the output series before any splitting. There are four policyholders who made claims and six who did not. The base entropy is therefore: