F 9 is added to twice a number and this sum is multiplied by 4, the result is the same as if the number is multiplied by 4 and
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Answer:
15.87%
Step-by-step explanation:
Given that:
The mean (μ) = 1000 hours, the standard deviation (σ) = 100 hours.
The z score provides a means of measurement in statistics to determine the variation of a raw score from the mean. The z score is given as:
To find that a randomly chosen light bulb will last less than 900 hours:
Therefore, P(x < 900) = P(z < -1) = 0.1587 = 15.87%
Given that initial time for jogging is,
After each week the time is increased by
This gives an arithmetic sequence.
To find n such that,
Therefore,
So,
Therefore, 9 weeks before you are up to jogging 70 minutes.