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Mathematics: Post your doubts here!
ZERO standard deviation means EVERY value is equal to the mean. So since the mean cost of all of Fei's rides is $2.5, the cost of each ride must also be $2.5. -
Mathematics: Post your doubts here!
↓--↓-↓--↓--↓ _*_*_*_*_ The arrows indicate the 5 gaps to put the poodles in. You can see that this way, we can ensure that there is at least 1 other breed of dog between two poodles. This is equivalent to "no poodle is next to another poodle." There is, however, a mistake in the final... -
Mathematics: Post your doubts here!
(1) Since each trial either stops when a 6 is obtained, or 4 throws, the number of 6 obtained in each trial can only be 0 or 1. So the expectancy is the same as the probability of getting a 6 in a trial. This probability = 1 - (probability of getting no 6 in four throws) Probability of getting... -
Mathematics: Post your doubts here!
Answers will be ax + by + cz = d + 70√2 and ax + by + cz = d - 70√2 The values of a, b, c and d are the same as you found in part (i). Basically, the only change from answer to part (i) is that we add or subtract a number to d, And this number is equal to the distance (14) times the modulus of... -
Mathematics: Post your doubts here!
This is a common way of solving differential equations. Exactly which part are you confused about? -
Mathematics: Post your doubts here!
AOBX refers to the whole shape. So the area of AOBX, or A(aobx), equals the sum of A(aob), the triagle, and A(axb), the area between the chord and the arc. Put in an equation, this means A(aobx) = A(aob) + A(axb) Since A(aob) = A(axb), A(aobx) = 2 A(aob) -
Physics: Post your doubts here!
Shouldn't it be 9000 Hz? The signal bandwidth is 18 kHz; the audio bandwidth is half of that, which means 9 kHz or 9000 Hz. Audio (or message) bandwidth is the same as maximum frequency of the audio (or message) signal. -
When looking back at what I've learned, those I forgot quickest were things I've never used...
When looking back at what I've learned, those I forgot quickest were things I've never used since learning.- DragonCub
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