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How many times must a man toss a fair coin so that the probability of having at least one head is more than 90%?

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The man should toss the coin 4 or more than 4 times
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4 times.
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Mechanical engineer by profession always ready to help in technical core as well as engg. drawing

The man should toss the coin 4 times
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Mathematics of 6th to 12th, electronics and communications diploma/degree.

4
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Online Tutor

4 or more than 4
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For 3 tosses the probability of getting at least 1 head = 7/8=.875 thats 87.5 % for 4 tosses = 15/16 = 0.9375. thats 93.75% So, minimum 4 tosses are required for getting the probability of having at least one head more than 90%
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SME in Mathematics & Statistics

Probability of at least one head in 3 tosses = 7/8 = 0.875 0.9 Hence, the answer is 4.
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Home Tutor

4
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More than 100 times.
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AMIE(Electrnonics & Commn.)

11 times
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