According to a study, suppose the probability that a randomly selected child aged 8–12 spends more than an hour a day online is 0.71. Let X be the number of children in a randomly selected group of 50 that spend more than an hour a day online. (a) Compute the expected value and standard deviation of X. (Round your answer to two decimal places.) expected value standard deviation (b) Fill in the missing quantity. (Round your answer to the nearest whole number.) There is an approximately 2.5% chance that ? or more children in the group spend more than an hour a day online.

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