A bank report looks at what strategies and measures financial institutions are pursuing to provide mobile financial services to their customers. In a response to a survey question about barriers hindering greater consumer adoption of mobile banking, in a survey of 125 financial institutions, 90 said security concerns are a barrier, 66 said lack of trust in the technology is a barrier, and 19 said difficulty of use was a barrier.

a. Construct a 90% confidence interval estimate of the population proportion of financial institutions who said that security concerns are a barrier hindering greater consumer adoption of mobile banking.

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(Round to three decimal places as needed.)