Two neon lights are turned on at the same time one blinks every 5 seconds and the other blinks every 8 seconds when will both blink at the same time

40 seconds

Step-by-step explanation:

They have that multiple in common

Just find the lowest common multiple of 5 and 8.

So:

LCM [5, 8] = 40

At 40 seconds, both lights will blink at the same time.

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.