WHAT IS A BLOCK CHAIN ?
WHAT PURPOSE DOES IT ACCOMPLISH ?
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The life time of a certain kind of battery has a mean of 300 hours and a standard deviation of 35 hours. Assuming that the distribution of life times, which are measured to the nearest hour is normal, find the percentage of batteries which have life time of more than 370 hours.
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A blockchain is a decentralized, distributed, and oftentimes public, digital ledger consisting of records called blocks that is used to record transactions across many computers so that any involved block cannot be altered retroactively, without the alteration of all subsequent blocks.
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