KnowledgeBoat Logo
|

Mathematics

What is the probability that a randomly chosen leap year has 52 Sundays?

  1. (17)\Big(\dfrac{1}{7}\Big)

  2. (27)\Big(\dfrac{2}{7}\Big)

  3. (57)\Big(\dfrac{5}{7}\Big)

  4. (67)\Big(\dfrac{6}{7}\Big)

Probability

1 Like

Answer

In a leap year, there are 366 days.

366 days = 52 weeks + 2 days

The 7 possible pairs for the 2 extra days are:(Monday, Tuesday)(Tuesday, Wednesday)(Wednesday, Thursday)(Thursday, Friday)(Friday, Saturday)(Saturday, Sunday)(Sunday, Monday)

Total number of possible outcomes = 7

Number of outcomes where a Sunday occurs = 2 [(Saturday, Sunday) and (Sunday, Monday)]

Number of outcomes where a Sunday does not occur = 7 - 2 = 5. {i.e,(Mon, Tue), (Tue, Wed), (Wed, Thu), (Thu, Fri), (Fri, Sat)}

Let E be the event that a leap year has exactly 52 Sundays,

∴ P(E) = Number of favorable outcomesTotal number of outcomes=57\dfrac{\text{Number of favorable outcomes}}{\text{Total number of outcomes}} = \dfrac{5}{7}

Hence, option 3 is the correct option.

Answered By

2 Likes


Related Questions