Answer: B. maritime trade networks
The Chola dynasty was one of the longest-reigning ones in the Indian subcontinent. They were originally from the Tamil area, around the Kaveri River. Their reign represented the height of Indian sea power.
The empire owes most of its success to their excellence in foreign trade and maritime activity. They played a major role in regional and overseas trade, and expanded their influence all the way to China and Southeast Asia. The Tang dynasty of China, the Srivijaya empire and the Abbasid Caliphate at Baghdad were their main trading partners.
The number of expected males and females to brush their teeth at least twice a day are : 135 males and 147 females.
<h3>What is proportion?</h3>
Proportion refers to the part of the things or numbers which are comparable with each other. For example: the weight of the Rahul is 70kgs and weight of the Mohan is 100kgs. Thus the Mohan's weight is greater than the Rahul's weight.
The pooled samples by combining the sample proportion to that of the successes in the each samples and combining the sample sizes.
P^ = (122+160)/(210+228)= 282/438
Then multiply this pooled sample with the two sample sizes:
Expected males = n1*^p = 210(282/438) = 135.21
expected females =n2*^p = 228(282/438) = 146.79
Thus the expected numbers of males are 135 and expected numbers of females are 147.
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