Question 748200
Null Hypothesis: p = 0.3
Alternative Hypothesis: p ≠ 0.3

Sample proportion: 25/100 = 0.25
Test Statistic, z = {{{(0.25 - 0.3)/sqrt(0.3(0.7)/100) }}} =  -1.0911
Critical z:        ±1.96

Fail to Reject the Null Hypothesis because the test value is between the lower and upper critical values.
Sample does not provide enough evidence to reject the claim that  30% of its customers are interested in high speed internet services.