Freddy the frog is climbing up a well. Every day he climbs up 3 m but some nights he falls asleep and slips back 4m at the start
1 answer:
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For this case we must find the product of the following expression:
We apply distributive property term to term:
We add similar terms:
Finally, the expression is as:
Answeer:
Answer:
0.0359
Step-by-step explanation:
Data provided:
mean values of three independent times are 15, 30, and 20 minutes
the standard deviations are 2, 1, and 1.6 minutes
Now,
New Mean = 15 + 30 + 25 = 65
Variance = ( standard deviation )²
or
Variance = 2² + 1² + 1.6² = 7.56
therefore,
Standard deviation = √variance
or
Standard deviation = 2.75
Thus,
Z-value =
or
Z-value = - 1.81
from the Z-table
the Probability of Z ≤ -1.81 = 0.0359