As the number of bystanders who are present at an emergency increases,the probability that any one bystander will help ,and the length of time that passes before help occurs .

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This is known as the "bystander effect," where individuals are less likely to offer help to a victim when other people are present. The presence of more bystanders leads to a diffusion of responsibility, decreasing the likelihood of any one person intervening and increasing the time before help is given.

As the Number of Bystanders Who Are Present at an Emergency