12.5%. there is a 1 in 8 chance that all three times it will land on heads.
Answer:
100,000,000
Step-by-step explanation:
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Answer:
3x + 2y + 8
Step-by-step explanation:
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Answer:
Step-by-step explanation:
Both 115 and 145 mph are above the mean. Draw a normal curve and mark these speeds. 115 mph is 1 standard deviation above the mean; 130 would be 2 standard deviations above the mean; and 145 would be 3 s. d. above it.
We need to find the area under the standard normal curve between 115 and 145. This is equivalent to the area under the standard normal curve between z = 1 and z = 3.
I used my TI-83 Plus calculator's DISTR function "normalcdf(" to calculate this area: normalcdf(1, 3) = 0.1573.
The area between z = 1 and z = 3 is 0.1573. In other words, the percentage of serves that were between 115 and 145 mph was 15.73%.
The product of the two numbers with different signs is negative so 2(-12)=-24 not 24. Then -24 -(-30)=-24 +30=6