Posted by **Joy** on Sunday, January 22, 2012 at 5:38pm.

Shown below are the data giving the length of life of lights in an underground tunnel.

9.0 months 7.0 months

8.2 months 8.3 months

7.8 months 8.1 months

7.5 months 7.6 months

9.1 months 7.4 months

I calculated the standard deviation to be about 0.679.

Estimate the probability that a random chosen light will last as long as 7 months after installation. Assume the data to be described by a normal distribution.

Can anyone help me with the process I would use to calculate the answer? Thanks!

## Answer this Question

## Related Questions

- Statistics - Shown below are the data giving the length of life of lights in an ...
- math - A person takes out a monthly installment loan of $2000 with an annual ...
- Statistics - . A certain company makes 12-volt car batteries. After many years ...
- Statistics - A certain company makes 12-volt car batteries. After many years of ...
- math - John's account of 98.50 has been delinquent for 3 months. After 90 days ...
- Financial Mathematics - The Z Corporation needs $180,000 in 60 months. If they ...
- human growth and development - According to the Bayley Scales of Infant ...
- stats - 2. The average age of a child in kindergarten is 66 months. The standard...
- math - Mrs. Diaz wishes to save at least $1500 in 12 months. If she save $300 ...
- psychology - Infants generally sit up without support at a.9 months b.3 months c...

More Related Questions